I think, the main issue is related to playing County cricket. I don't think PAK bowlers learned swing from their domestics ever. Apart from Fazal Mahmood (but he was the Alec Bedsar of matting wickets, a brilliant & accurate cutter/seemer of the ball - also, he debuted for PAK at almost 28, after playing few years in British Indian system & league cricket in UK), none of the PAK pacers mastered the art of swing from domestics.
- Khan Md. fast a fast medium new ball bowler, not sure how good he was with his swing. He again, played in Leagues in UK before playing for PAK
- Sarfraz learned the conventional swing at Northampton; then invented his way to get wickets in PAK wickets
- Imran, Wasim, Waquar, even Aaquib were very good bowlers with pace & fundamentals of fast bowling (fast run-up, arm swing, height, shoulders ...), but each & every one developed as a compete package from Counties. Imran several times said that he learned out-swing at mature age from Snow & leg-cutter from Lillee. Waquar hardly had any out-swing before his County season on 1990 - I saw him in WSC on 1989-90, he was gun barrel straight with new ball.
- The swing Sultan was very good with his angle, pace & bounce, even on his debut - but he wasn't doing his banana swing staff - one can check his 5/21 against AUS at MCG. A 6'3" hostile fast bowler coming from short run-up & always at you is difficult to handle, but it was nothing like what he was at MCG, 5 years later. As a kid, I never saw him in action in his early days, but some of his clippings in 1984-85 NZ, WSC & later WI Series doesn't tell much about his swing. Wasim Akram of 1985-87, till IND Tour, was totally different from the The Wasim Akram we saw after he toured ENG in 1987 & joined Counties later.
- Zahid & Sohaib were not swing bowlers - they had pace & they could reverse it. Sohaib hardly controlled the new ball - he is probably the least effective great fast bowler in history in his 1st spell; didn't even had the proper grip; Sami was comfortably better than him with new ball, but he didn't play in Counties, hence his game stuck at club cricket level.
- Sabbir averages 23 for his 51 wickets in 10 Tests, but he was never a Swing bowler; very much in the mold of Courtney Walsh, who could drop the new ball on awkward length, albeit with a flawed action.
- Razzak at one point clocked 147KM, but he never swang the new ball - for his pace, he was great with old ball for few years & in general seemed the new ball. Not surprisingly, he was most effective in AUS with new ball & in Asia with old ball.
- Asif was "as ordinary as you can get" new ball bowler with 6'4" height & 135km max. speed, without much skills with new ball. Played 1st Test at SCG - went for 0/150 or so at 4.5+ rate, lost his spot. It was Woolmer that worked with him for a year (Credit goes to Aaqiub as well, for that he was the Bowling Guru that time, but I probably know whom to praise for what) & we found a different Asif 18 months later.
- Gul was never a swing bowler - he seemed with the new ball & reversed the old one. I can't recall Gul taking a right-hander caught at 2nd slip in his first spell. He took 5for at Lahore against IND mostly with his movement off the fresh wicket of Day 1. Wahab is almost identical without the seem of new ball - in UK, only place he could bowl is Oval - the fastest of English tracks.
- I do praise Amir lot, because he was the only PAK pacer I saw in my life time with natural skill of controlled swing with the new ball - but he went for few dollars more & 6 idle years has put lots of rust on his system - Amir of 2010 summer could have won the CChurch Test against this Kiwi lot alone. Bowlers like Fazle Akbar or Kabir Khan did swing it, but probably they themselves had not any clue which way it's going to swing, as the swing for them was natural, it's not a skill they had the control to use effectively - same goes for Amir Nazir, with a bit more pace & less control (& no fitness) - almost carbon copy of a Rahat Ali. In between them, to be honest, only PAK pacer whom I saw genuinely swinging the new ball in a lovely shape was Azhar Mahmood.
Apart from technical skills, I don't think current PAK pacers can swing the new ball even if they are supported with the best coaches. Simply because, you don't need to learn swinging the new ball in QA style - 170 per score wickets, played in NOV-DEC winter under heavy weather, on sluggish wickets & soft but green tops. In QA Style, you need accuracy - put the ball just short of driving length on line at 125KM max. - it won't bounce over knee, it won't come on to bat, preferably it doesn't move much to miss the stick - then add to 80% batsmen playing FC cricket without the fundamental batting technique of taking bat-pad together against in coming balls, taking impact out side line while playing forward defense or leaving away swinging balls out side off - result is 80% dismissal as Bowled or LBW & the best bowling averages sometimes in single digit - even our Khaled Mahmood would have averaged 15 this time of the year with his 110KM dibly-doblies.
In fact, if I were bowling medium pace now in QA Style, on those wickets, I would have tried not to swing it much - that reduces my chances of getting wicket. Edges won't carry to slips, even if it carries 50% will be dropped; most LBW shouts will be declined for extra movement & often inside-edges; to swing it, I'll have to pitch it up - that's allowing batsmen to drive & few soft runs in a game where 450 combined total is often more than match winning - chances are high that Captain won't call me after those driven boundaries & I'll lose my spot in next match. Better choke the batsmen with Robin Singh staff - this guy GroundHomme will be George Lohmann in QA Style.
Things won't change until & unless bowlers feel the need to swing it. A lot of skills in cricket (particularly bowling) are self taught; but you need the stage to motivate yourself to run that extra mile & find it, learn it, practice it to have the control & apply it effectively for success. Previously, at least it motivated bowlers to run hard & throw the "thing" fast in air, like there is no tomorrow - now not even that's required - Tabish Khan & Sadaf Hussain model is the way forward.
Quaid E Azm style Zindabad ...........
Aga Zahid poyendabad .......
& Long live the Domestic wickets.