Terry and George,
Check out the two videos below and make sure you are really spending some good time freeing up your heels/ankles. The other thing you should try is barbell or lax ball smashing your posterior tib. This is the muscle that runs just behind your tibia on the medial side. This muscle directly affects your arch and if it’s dysfunctional it can cause some problems. If it’s tight it can cause your ankle to collapse when your ankle is placed into a dorsiflexed position. Lastly, spend a significant amount of time barefoot. You can try adding some short distance running in the grass barefoot or on a track. The more time you spend out of your shoes the more the intrinsic small muscles of the foot will develop. 
Good luck,
MWOD Coach

Heel Mobilizations