Sjakalina 4-3-3 v2

I've been tweaking the tactic a bit, and are having some great results.
Still struggeling really hard to have decent outcome on the DMC position. Clearly lowest average rating, despite having amazing results.
My main choice is either Diego Rosa or Manual Ugarte, but both only rated at 6.66 or 6.67
All my other starters are avg between 7.06 and 7.60.

Any suggestions on what to try? i am having Regista or Ball winning midfield in my mind, but i don't want to weaken the balance or defensive structure to much - and still want to get the best out of these creative DM's