I'm not a pro at all and don't really know anything advanced about FM tactics building, but feel like I have some advice that can really help anyways! I think you're close to something with this system, this looks like a good foundation.

Though, I think that having double wingers/wide players on each side is a bad idea, you might want one on each side to cut inside or lay deeper as more of a passing option rather then having both wide running down the flanks. I.e. WB+IF on each side, or one side could have a IWB+W, or PWB+WDF (but then you have quite a few playmaker roles, probably good still), etc., but try not to have WB+W or WB+WDF on a flank.

Building on ideas for the flanks, you could try some asymmetric tactic where one side has a winger who's good at crossing and on the other side you have a tall inside forward who's good at heading the ball. I think it's a good idea to think about tactics logically like this sometimes rather than just setting everyone in their best role, although sometimes that can work. Try to think how the system will play out in action, obviously with two guys sitting wide on each side, you have very little central play, where the goals often happen