When you wore the heel lift were you also working on mobility?
If not I would look at doing that. You may need an adjustment to align your hips.
here are a few to start with
The QL Is NOT a Bone…Even in THE Matt Chan
Jill Miller Smashes Your Guts! (and psoas, and tacked down viscera, and matted down abdominals…) Part 2
Psoas Flossing and Biker Hips | Episode 301
Episode 290 Haiku Contest And Landing Position Part 2
Episode 129: The Twin Bowstrings, the Psoas and Scalenes
Episode 75: Your Inside Psoas Bits, World Record?
Episode 26: Hips and Seppuku: Psoas and Hip Soft Tissue Mob
Yes, the positioning may revert back to the old positioning. Its like learning anything new constant reminders are key. Getting the areas around it more supple will help feed slack to the system and help in holding the changed positioning. Keep chipping away at it.
Episode 128: The Pelvic Fault and Back Pain
email me [email protected] and we can look at some additional resources