When I read your title, I thought you are gonna tell about bed performance(18+teq).
And your is under the tutorial & guide.

For yr problem;
-try to swapt the side of yr ST(L>R, R>L)
-try lone striker
-train hard & put sp to Def, Phy&Ment
Did u give them to take FK or CK?

if any of the above doesn't affect, your idea might b the best choice for the preparation of new season!