Well over 5000 rpms? How much the analog and PP shows at 34 mph?
Rule of thumb, a 13x13 prop should spin about 3300-3350 @34 with 2 persons crew and a 180 lbs skier.
If you're turning that at 34 and top speed is 36,you're not running 5000 plus rpms for sure.
Edit:Rereading myself,with different cupping of the prop,the rpm range could go up a bit more then 3350 i think.Like up to 3450 i guess...
Not a prop expert.