Multiplayer First Person Shooter Kit

Hi!
Has any of you experience trying to change the set of animations of this pack to others?
The author of this plugin answered cordially via private messages, but I need information a little more detailed, especially those who managed to solve the problem.

The problem:
This pack manipulates some spinal bones in the animation bp, and replacing animations end up in rare results.
For example, when the character walks sideways, I get a rare spine twist.

this is the author response, and probably he is right
“Your animations might mess up the transform space, when the bones are rotated differently. I belive the view pitch spine rotations are done in component space, which means they always rotate around the Y axis of the character actor, which might not line up with the rotation of your mesh.”

So again, Any of you found and solved this problem?

thanks!