Heroes Underpowered?

[colorado_13]

We are playing with the same group around once a week, at least 3 or 4 games each time. First Zombies were always winning, then it started to even out and now im feeling the heroes are a little bit over powered. I think it has to do with people playing better. As i stated before, i think that the zombies are better on the early game, and if you fail to cause big damage in the start and the heroes get to find good items, they have better stuff and more permanent cards. One game victor got some hand weapon plus monkey wrench, so there was no way i would keep a good remain in play card. We are using a house rule to select the heroes, where you get 8 semi-random heroes that form a pool, if the heroes get to pick their heroes freely it gets even more unbalanced.