Where do you put your weakest players in soccer?

Your situation is typical and why I think it's harder to coach Rec than Travel. Obviously, you've read my feelings about how important it is to put brave players at Fullback. Your problem is where to hide the weak players. If you need to hide 4 players at a time: 4-2-3-1. Put your strong players in the center -- 2 strong Fullbacks and tell them to stay in front of the goal, and put weak players at the other 2 Fullback positions and tell them to NOT go in front of the goal, but to play the "Wings". Put your 2 best athletes/defenders at the 2 Stopper positions and let them roam. Leave put a good player/scorer at the Center Mid position and put weak players at the LMF and RMF.