So I think that some of you are forgetting that these characters cost 1 thousand credits. While that doesn't entitle them to god-status, they should be stronger than other characters. I think the dynamic of ramjet, pic/rail and tib/volt each have their roles. Anti inf, anti-tank/inf and anti everything are all fine.
They all have their own different armors, sidearms, explosives and range/reload differences. I don't know why anything needs to change