Looking better this happen because it use the "light-missiles", nuke was moved on big missile launcher.
About the weapon nerf, is not complelty true, because now the spidertron can install the K2 equipment that is very more powerful than vanilla, also u can fight together with the spidertron, and this make it more powerful, because character have a powerful arsenal.
I have not enough reasons to identify this as a bug, and I don't want unbalance the game without testing, I'm sorry.
Ps: also make one slot that use the big missiles instead of light-missiles will nerf the spidertron in case that want be used as figher and not as artillery.