Well, there are a few things I did. One is I made armor into DR, which means that a fighter decked out in scale is likely to withstand a lot more punishment than a wizard in cloth! It doesn't even really take much. I think 'scale' in my system is DR4 (and you can get one more from a shield). That's a LOT, basically half damage from level 1 foes for at-will attacks. Fighters also have less outright need to use their VPs for stuff besides healing. Wizards OTOH power a lot of their more significant attacks with VP. The upshot of this is that your average wizard is going to be in trouble if he's getting chewed on. He takes full damage (DR 0) and he's either going to have to live with it and try to avoid hits, or else shut down using his most effective powers and stick with at-wills (which is OK, he can still get stuff done). You could, of course, play a 'staff wizard' type of build that sticks to short-range at-will attacks (which will do more damage, being short range blasts and such) and maybe get some DR, plus a high CON.