I like Dre's idea.
I might add that does every player have to weight 4.0? My guess is that's the
maximum limit. If you have players that you think perform better at a lesser weight (i.e. RB or WR) then leave him be! Just raise the weight of the players (my guess is the O and D lines, LB's) that you think would make you more competitive.
In fact, I like the idea someone had of different weight for different positions. I don't think most are quite ready for that yet.