Yep this is a problem on a lot of 18’s. The fuel map is very rich in the bottom end. Latest from Polaris is the map changes once you have more than 18 hours at 5500 rpm or more.
Maybe not ?
my old 2011 did that to , and still to this day
its one of the family ditch bangers now but has
had 2 different dealers through all the parts under the sun
on it they wanted with a fix kit to
and still , fouling plugs every 2 rips or so
All stock ,it never did it up on the mountain tho
just in the parking lot and in the prairies ditching