Anyone work with Symmetrical | Mirrored Bone Attachment Rotation?

Hello Unreal Answer Hub Gurus,

The Symmetrical Attachment Rotation fail - See Videos. Attachment uses relative rotation and YZ axis inverted +180 degrees of the ‘normal’ rotation on opposite side. Rotation on Y axis, is throwing everything off. I’m open to any and all recommendations. Thanks in advance.

Video [1][1] [2][2]
[Example Blueprints][3]