Well my friend, I have a same situation this season. My advice as you can see in that thread
http://forum.topeleven.com/top-eleve...-scouts-4.html
is to SEEELLLL.
As you're saying, ST and AMR-L are the positions that giving the victories. This is the time in league or CH.L. or CUP that you 'll win or loose the season.
Amane's method could be working but that means you have another player to use.
So, with the money and few T, buy two players, 5*, with the higher q if find, age over 28 y.o. and test who 's performing better .