Your formation is interesting. My philosophy is keep balance, so if I play with offensive formation like yours then I add blue arrows and avoid red and reverse; for defensive formations I use more red arrows and less blue. According to this strategy I would add blue arrows on amc's and mc's and remove red arrows from ml and mr. If opponent uses 4 wingers formation, then add blue arrows on ml and mr.
Your team has high quallity, offensive formation and good attacking skills so protecting defence a bit is always good. Balance is key
Btw. buy cheap 5* oldies (under 2M per player) to strenghten your reserves.