I do have the fix bounding box enabled. I think its mostly for consistency across systems and team render.
About IK-spline, I thought it might not work in the case where an object needs to travel along a spline. But I wonder if it could work by rigging the object then having the first joint animate along another spline with all other joints following along? I’ve never done an IK rig so I’m not sure that makes sense.
thanks