true.. i did not thought of a 4-3-3im more the defensive guy... first priority is not to consede any goal the rest will come by itself. but you can change of course during the game see how it goes.. and also true opponent is not that much stronger and i see he only has 3 subs... this could be good for you
EDIT: i just noticed... he is lvl 8 and you are lvl 3... so i guess your opp is an abandoned team.. you should manage to beat him