My first thought was a seat issue. Maybe too wide a seat or nose too high. Or perhaps you would do better with the seat pointed slightly to one side. (I ride with all my saddles pointed slightly to the left. I am also finding as I get older, I am becoming less and less symmetrical.

I'd try a ride with the wrenches to adjust the seat pin and clamp and experiment. (And if you find that helps, be prepared to do a few more rides to dial in "perfect". Settling for less than perfect when it comes to seats is settling for a lot less!)

Ben