Speed should reveal rhythm, not turn the movement into a forced end-range twist.
Rotation is shared through the feet, hips, rib cage, and arms. A smaller turn that is distributed and controllable often gives you more to build from than a larger turn you have to force.
Retest without treating the result as proof that you are fixed or broken. Compare what changed, keep what transfers, and decide what deserves another week of attention.
Try this today
Make the idea practical.
Try the same turn slowly and then at a natural speed; compare smoothness rather than range.