Yeah, this is about the only real solution that doesn’t involve modifying each animation with the proper constraints. ^
For anyone else:
IK bones by default are constrained during animation to follow their corresponding bones throughout the animation.
Retargeting them seems to offset them but they aren’t, they are in the same place, it is in fact the hands that are offset due to the fact that the Arms are Longer/Shorter then the other characters
This can’t be circumvented using any method provided by the Unreal Engine.
Translation Retargeting Settings won’t help
Retargeting won’t help
Sharing Skeletons…won’t help
Nothing…
The toolkit Tuatec has made is the closest thing to a real automated solution you are probably going to find.
One suggestion offered was to share skeletons and create a Virtual Bone from the head to the hand and then from that Virtual Bone to the other hand. I haven’t tested this though