Hello...
Same here, I win easily on greek matches but I struggle in the CL matches.
For the greek superleague (any match, derby or not) I use the classic 4-2-2-2, meaning 2xDC, 2xMC, AMR, AML, and 2 ST
or 4-2-3-1 (2xMC, AMR,AMC,AML and ST)
on both I go full attack, but you need at some point...