You will learn that "the Conditions" may dictate adjusting to your needs..
As long as the PTO shaft is relatively straight, you can run the rear as high as you NEED, to allow the trash to exit the chopper..
For pastures, you should be back to around your 1" higher in the Rear..
SHARP knives are a Must, to best use your power..
Beware, advancing the timing without a Timing Light..you can get into detonation and ruin your Rings before you realize it..
I prefer to go Counter-clockwise with my BushHog. You get the best cut by NOT taking a full "Cut width", allowing the cutter to clean-up what the previous rear wheel tramped down.
Don't re-cut the same day, allow the moisture to leave and the cutting will be easier..
Sometimes I think that anything smaller than a 60" chopper is too narrow and not efficient..
I use a 72" (6ft) Bush Hog on my JD "B" virtually anywhere..