I personally feel like the maximum speed and damage upgrades are at a good level, but you might want to check out using some more of the defensive buildings and teleporters as a substitute for even more suit upgrades. Pilot still doesn't have a name at the moment, I've gotten too used to just calling her pilot at this point. As for the stomach noises I have good news! There's an advanced menu in the volume settings that will let you control the volume of those separately, among other things.