Do you use a seat bag? It's typically the velcro seatpost strap that rubs shorts. You can put a small piece of black duct tape over the closure, or cut it so that the closure is in the center of the seatpost (be sure to seal the ends in a flame if you do cut it).

What saddle do you use? Sometimes they do have seams that can rub. Or, if you're using a tensioned leather saddle, maybe some of the metal parts are rubbing. There are workarounds depending on what part exactly is rubbing. I wouldn't go for a shorter nose just because of rub if your saddle fits you otherwise.

You can also pay attention to whether you're weighting both sides of your forefoot equally when you pedal. If you're pedaling knock-kneed, that might be because of imbalances in your feet.


PS - 50-75 mpw is plenty respectable!!! Welcome to TE.