Mr. Solbrig:
I am grateful for your depthful input.
<<assuming, as you say, that most underlying medical conditions have been ruled out.
For better or worse they appear to have been.
<<The simplist approach is to find a competent body worker in your area, ideally one who knows martial arts.
Wish there was a true "board certification" (in the manner of Medical doctors) for either, it would make the search far simpler. My suspiction is that depending on their experience/"tools" each would likely describe the problem in the manner of the joke with the 12 Blind men and the Elephant? (Know the one?).
I know Bonnie Prudden's stuff as well as the Alexander technique at least conceptually, and experientially in a minor fashion. I am pleased I've at least done a fair job describing my general problem anyway!
<<Still, in the case of the butterfly stretch, it seems unlikely you performing it in extremely misaligned fashion (though its always good to notice what you are doing). I would assume with you that there are some muscles preventing your action.
My suspiction as well. Still it is possible the former is true, unlikely but possible. (I have made Yoga teachers weep with puzzlement & frustration

most however were very young not trained well, if at all)
So how does one "isolate" the potential hip muscles, their respective actions to figure this out??? I cannot disconnect my parts and ignore the lower back, the ilopsoas the erector spinae <sp.?> any/all/none of which might be a minor factor in the whole greater issue (right leg, butterfly stretch, much higher-tighter, nearly painful)
<<Another thing to do is experiment with discovering all the directions you can move your leg
Exploring slowly

very blessed slowly, so as not to let gravity or momentum give a false impression/reading.
<<You can also start working on self-massage at the same time.
Unforunately the body will not permit us to go very deeply into positions, stretches anything that cause contraction-pain hense mandating external assistance/expertise to do the exploration.... the body protects itself.
<<It's actually not that important figuring exactly which muscle is causing the problem.
But if I can determine the "bad part" I can figure out what exercise, technique to send at it/them and reduce its "mockery" towards my best efforts. If I can "name it" I can work to change it, unnamed and I fumble perhaps to positive benefit, but not as precisely as I am hoping...
<<Beyond misaligned movement, there can be emotional issues related to particular muscle tensions.
Not a big fan of the "Emotional Armoring" idea. Accept the mind does have a signifigant effect towards ones physiology but question the validity of anceint experience being directly causal of current problems (ie a "mean father" figure causing my right hip/lower back to do whatever it might be doing with me today...)
<<The Trigger Point Therapy Workbook" by Davies
Fond of the Leon Chaitow "Soft Tissue Manipulation" materials as well as I'd mentioned to someone before in the thread as well as the John Jerome "Staying Supple" book.
I will explore the Davies as funds permit... (didn't he write something else a while back??? His name is very familiar but canot place him...)
<<We at Academy of Qi Dao will be publishing a book on the basic alignment principles of Qi Dao
Of the publsihed materials available in English, would you say there is a decent parallel in the written Alexander materials to what/how you express your views/understandings of the body?
As time allows, I will attempt to visit your website...
I look forward to other thoughts you might have, and most definately for your elliquence & time
Most Gratefully,
Jeff