except that light weapons suffer 1 difficulty at close range, heavy suffer 2.
also pistols are suppose to do less damage, they are also easier to conceal, remember all combat damage is not meant to be equal, some give better out of combat benefits.
with my players if they want better effects from something in combat then i make them pay for it, either they can pay xp and have the talent stack, or they pay credits and upgrade their weapons, the options are there, they can pick which they prefer.