Wire consistancy would help alot with signal flow. I'm actually a wireman by trade and i went to school for audio/video engineering with and electronics base.. My buddy and i were talking about batteries and such for airsoft and possible making our own or buying some off of ebay and re-doing them just as an experiment. Shouldn't be too hard. I helped wire a big percentage of the new city tv omni building - cat6, audio, fiber and video and some power..... Something that might help too with your batteries and keeping the wires a little bit sturdier and using some heat shrink on them...
ALSO>>>>Using some Hellermann tubing to secure your wiring would help..