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I've trashed 4 sets of bibs in the last 12 months with this issue. Actually going to get a fit this weekend to try and fix it.
Assume it's a leg length discrepancy issue, as I had a short left leg (the side that rubs) identified on a previous fit but I binned off the shims after a few months. My leg length issues cause my saddle to sag on the left side which probably contributes to the troubles. I'll see about new shoes and arch support too, perhaps a new saddle and report back.
did you solve this? i have the exact same issue where the pad in whatever shorts i wear breaks up in the exact same place (right side, top of leg / inside of thigh on the chamois pad) after a couple of thousands of km of wear. i can't really see that part of me is rubbing on anything but i am pretty sure i don't sit squarely on the saddle.