What makes you think you don't have the flexibility or the physical capacity to create a more dynamic pivot?
Matt F is correct,your swing is all arms thats why you lack power.You may never attain the pivot action of Hunter Mahan but you can certainly do more than you are currently doing with some good tuition.
Just curious but is your swing TGM influenced?
I really appreciate the responses and input, so thanks to anyone who's taken the time to watch and respond!
I guess I wonder about flexibility because i've always had what I consider to be flexibility issues, example...I have never been able to do basic stretches like toe touches, etc (and when I say never, I mean not even when I was 8 yrs old)...and when i've tried basic "screening" tests like those on mytpi.com....I basically fail all of them. But besides all that, what i notice in the swing video and in my practice swings is that I'm not able to pivot back without losing my posture...and my hips feel restricted, then start to slide back away from the target. Add to that what looks like no wrist cock at the top and at start down and I think it = no power.
So I agree, it's all arms....I'm just looking for what I need to do to make a more dynamic pivot. My swing is influenced by TGM in that I've spent a couple of years lurking on this site and i've purchased COFF and NSA. So I've definitely tried to work on the basics that Brian teaches.
I hope you're right and I'm capable of more, I'm looking for the "good tuition" you mentioned.