The game engine isn't perfect. So what I'll be doing to try to even things out is limit the playing time for players to a max of 50% above what they played in 2007.
This is to keep players like Joe Thatcher [1.29 ERA, 0.90 whip, 21 IP] from being even better than Papelbon or Nathan, and hitters like 31 year old Daryle Ward [0.963 OPS in 110 ABs] from being MVP candidates.
I'll base it on IP and AB.