Working up/downstream of where you see the issue.
Have you used a voodoo band?
If you lack extension in your hamstrings that needs attention.
Sounds like you need to take another look at how you are addressing the lack of internal rotation if you aren’t seeing improvements with what you are doing.
One to watch.
Pro Episode # 27 – Butt Winking Is NOT ok. Ever. (So don’t you even think it.)If
Have you had a coach watch your movement pattern when performing a squat and/or video the movement pattern so you can see exactly what is going on?