I have been using sport scout style pistons for years with three compression rings and an oil scraper with no obvious ill effect, and far less carbon build up.
Well set up oiling system seems to work fine with a scraper. I tend to use a straight 40 or 50 in really hot weather , not a 60., and on occassion in my bike, which I often thrash mercilessly, altho not for long distances, I mostly use a straight 30, altho this has the disadvantage of finding its way outside the motor in numerous places after a while.