Spock was rop for ever (atleast since 20weeks) if she did move position it was to go direct op. she remained op all labour and then decided to rotate when she was crowning (holy mother of burning ring of fire let me tell you - and she had a little hand up at her head too)
anyway... I spent my labour in that upside down position previously mentioned instictively...while it didnt rotate her my labour was only 5 hours *shrugs* dont know if thst had anything to do with it.
I did try alot of pelvic opening exercises: squats, rotating my hips etc.. have you thought about acupuncture or moxibustion?