Just picked up a used 18 Havoc x. Agreed on the turf mode. That would have been AWESOME. Also in High range when starting out it is quite "jerky" "clangy" "rattley" "notchy" I don't know how to explain it perfectly but its almost like you are trying to turn on concrete type of "lurchy" even when going straight. Dealer and Cat Rep said it's normal and has to do with the engine braking somehow. Low range it is barely noticeable but high range it is quite distinct.
Yes, if you are going to barely push the throttle and go slow, put it in LOW. If you want to start in HI, give it gas and it won’t lurch and will just go. But if you are in HI and barely give it gas, it will jerk. It’s about the clutching and engine working together.