We mow a pretty steep hill - 15 acres.. First time mowing, we did not have a FEL. Like someone else, we were hoggin 10' material - could not see what was on the ground nor how the ground was shaped.
Went super slow..
Found lots of scarey stuff in the field. The previous owner had a passion for rock piles. He made them about 18" above the ground. You might say they were fun surprises to find!
The next year we put a FEL on the tractor and ran the field with the bucket low and curled for stability on the hills and as a braille method to find those damn rock piles.
By the third year, had a great idea of the lay of the field and wanted better vision. Dropped the bucket from the SSQA but wanted some weight out front on the arms so we run the fork frame without forks. Gives just the right stability and still allows the braille method when needed. As I am training others to run the field so I don't do all the mowing, I always suggest the fork frame be 12" off the ground. Doing so keeps them from trouble on the rock piles on a steep hill.
Arms up high? Not on these hills. Arms are put up around fences and speed is reduced to Turttle-1! We do not operate with arms up on hills. Ask how we learned... tippy tractors cause a lot seat pucker.