@WhitePaw2002, Here is the save file I mentioned. I could not attach it in a conversation or profile post.
So yeah, the spider seems to be slipping in place.
How to use:
W / Toggle - Move forward
S / Toggle - Move backward
A and D / Hold - Turn (Cant because it won't move)
i - Move back cannon up
J - Move back cannon left
K - Move back cannon down
L - Move back cannon right
Up Arrow - Move front cannon up
Down Arrow - Move front cannon down
Left Arrow - Move front cannon left
Right Arrow - Move front cannon right
These AA guns also have Target Aim mode on.
Uses control blocks, obviously.