Hi fishtaco,
bit late to the discussion but it's an interesting problem, any luck so far with the docs?
definitely sounds like you've got some good neural signs goin on, not surprising given the length of time you've had that trouble. Probably already been looked at but was your superior tib/fib joint checked for hypermobility or laxity versus the other side? any history of ankle sprains that side? Laxity here could place the biceps femoris under additional strain and further stress the joint contributing to your pain. bit of a long shot but it can happen.
I'd go with gcoe's suggestion and see an ortho PT anyway because you'll need some help reducing the neural sensitivity(s),if you get the pain in slump/SLR with inversion of the ankle you'll need a thorough exam from back to ankle.

Good luck with it!!!