PAK got 280 in first 2 games, because that was 330 tracks, not because the painstaking century that Haris or Rizwan scored. Today also, if PAK has to chase, team must not allow the asking to raise above 7 any time, better if they can keep it below 6. In modern games with Power Paly, the better teams often actually reduces asking against new ball and then allow it to grow slightly till 40 overs before final charge, but never allows the asking to go beyond comfort, be it at the cost of couple of extra wickets. With a good partnership, you can make up loss of extra wickets, but what is impossible is maintaining an asking of 150% (from initial asking) for 20+ overs, no matter how many wickets at hand - first batsman down, next man is instantly in at 7+ asking rate, which will inevitably lead to couple more quick wickets and the chase is over; end result might be a respectable defeat but that tactics hardly can win a game.