The bag is resting on the fender which moves up and down as it is attached to the fork lowers. Your fork tubes will get scratched eventually and may cause issues with your fork seals. I've seen it happen. I suggest moving higher by adding a strap to the lower triple clamps
was going to as the same thing. anything that rubs against another seems to wear the paint. my clutch cable rubs against headlight cover and has worn away the paint
You ever thought about getting a right side swing arm bag? I personally have one left swing arm bag on my iron883 considering putting a right side just for the space.