If you use 4 in the back, 3DM(R-C-L) and 3ST, your will have only 3 players on the opponent's field and it will be considered as an illegal formation, resulting in a penalty that your team will have only 20% possession.

Your opponent's team is 4 stars stronger than yours, so unless you really want to win, there is no need to play 3ST. Since he has no real MC, you can counter his formation by employing more MC on your side. I think 4-1-4-1 would be a choice for your consideration.