I think it was done by India once in the tournament that they scored in excess of 200 runs in the first innings. I do not remember any other match where any team scored 200+ runs. But my wording was that a score of 170-200 could be a competitive score if scored in the final.
Also doesn't the teams playing second face the same difficulty in batting from 7 - 15 overs ?
Pakistan scored 175 runs playing first and its was close finish despite the fact that Pakistan got 5 Australian wickets. So the team batting first need to score over 180 in order to remain in the match.
What we have seen is that side batting second score most of the runs in last 5 overs, as evident from NZ/Eng and Pak/Aus semifinals.
Pakistan would have easily won the match if Marcus Stoinis along with Wade had not put on 81 runs in just 6.3 overs. The target put on by Pakistan was not that bad and to an extent, they were in control of the match until Stoinis came in. Pakistan was able to beat some of the good teams in the tournament but they were not able to stop Australia. It is not compulsory that the team batting first need to set a target of more than 180 runs in the final. T20 is unpredictable, the team that plays well will always win.