In your case the opponent might very strong at 2 wings but he's lacking of MCs so u could exploit it
If your MCs and AMC strong then go for 4-3MCs-1AMC-2 ..attacking or normal (if he's stronger than u)/through the middle/own half pressing/short passing/no offside/no counter
If your MCs and DMC better then go for this: 4-dmc-2MCs-3 ..normal/through the middle/own half/long passing/no offside/no counter
Even not exactly same but rather similar with the formation in above but one of my team at level 13 killed off very strong opponents (although we have the same 7 6* players but his 6 stars is at 89 when mine highest also only 86)..he was league leader and i over throned him now..I didn't even attend the match but HIM
Good luck,bro