You must use the exact same settings as for the original 88mm gun. The animation controllers must stay in the Library (AnimationObject in GUNS_SUB.dat), you don't have to copy-paste them.
This thread can help you to understand how the whole mechanic is working:
https://www.subsim.com/radioroom/sho...d.php?t=256008 (don't take into account images #4 and #5)
Have you tried this:
https://www.subsim.com/radioroom/sho...90&postcount=5 ?