Yes I have similar issues ( flat feet, tight calves, etc etc). I’m in pt now to work on some Achilles pain which requires me to do a lot of hip and glute exercises ( Many of those you noted below). My left glute is actually weaker than the right , but the right side is giving me more pain in the glutes/hip.
I’m just know seeing how much I was disengaged from my core so I’m working to correct that as well as the hips and glutes etc. my range of motion is pretty good but that doesn’t negate the weakness that I have.
Thanks for the suggestions!!