Thanks for the inputs..... all good ones which validate that feeling as being "reasonable" for a swinger. Used it again today with really solid results.
I had that awful "chasing the club" feel on Friday, and hit many more pulls than I normally do, which sort of confirmed that I had that dreaded "over-the-top" motion working. To 12's point .... it felt like my lower body had "gone to sleep".
I hate to resort to "band-aid" swing keys since I've been studying TGM. This one seemed to work and I just wasn't sure it complied with the physics and geometry that we get from TGM.