Re:
I used SPD's for many years ignoring "hot" knees after a long ride, swapped to Time and these gave me a few more years before the problem returned. Tried Egg Beaters with no improvement. Moving the cleats back further than is recommended helped a bit. Shorter cranks made no difference for me.
Finally weaned myself off of clipless and now use flats even on the road, it doesn't look very cool but I can carry on riding.
I don't think any one has mentioned having a professional fitting.
Good luck with whatever you decide to do.
I used SPD's for many years ignoring "hot" knees after a long ride, swapped to Time and these gave me a few more years before the problem returned. Tried Egg Beaters with no improvement. Moving the cleats back further than is recommended helped a bit. Shorter cranks made no difference for me.
Finally weaned myself off of clipless and now use flats even on the road, it doesn't look very cool but I can carry on riding.
I don't think any one has mentioned having a professional fitting.
Good luck with whatever you decide to do.