(1) I would not modify the rims in any way.
(2) I'd contact the manufacturer about the problem first, not BF where you will get every OPINION under the sun.
(3) I'd try a different brand of tire and maybe a higher pressure. You state you keep it properly inflated but what is the tire width, your weight and the tire pressure you are running?
(4) I'd mark the spot on the rim where this happens and see if it happens again at the same place.