I'm sure you're used to your position, but most modern wisdom about saddle height is that the correct height is when the knee is bent 30 degrees from full extension and the pedal is at full extension, the maximum distance from the saddle. It sounds like you may be overextending on one side and not the other. Fitters can set the saddle for correct extension on your long side (assuming you have one), and build up the pedal or shoe on the other.
We're not racers, but my opinion is that as we age we should pay at least the same attention to addressing repetitive stresses as do the professionals. They may do a million pedal strokes a week and we only 100,000, but our bodies are (no matter what our conditioning) still more worn than theirs.