I have a suggestion that might work.
I dress between 5 and 7 a game.
Example if I am training IS and need my C to get 48 min my backup players will be small guys like a backup PG or a SG for example. Rarely do I find that a small guy position like PG will sub in for who ever I have starting in a big guy position like C or PF.
It has worked very well for me this season so far. But honestly, sometimes a 46 min game just happens because the coach is a dick lol