There's nothing wrong with making them stronger, as long as it's no more than 15-20% difference in strength regardless of optimizations used. This allows for some actually useful upgrades, without being overpowered.
(Obviously, this is not suggesting a 15-20% boost in armor is okay or the like. Anything that directly impacts survivability, like armor, bullet damage, damage reduction, etc. should definitely be held more closely I'm talking in terms of relative strength.)
Edited by DarkPulse, November 22 2012 - 12:04 AM.