FWIW, when we try to "feather" the clutch while trying to get rolling against a grade, the coach starts to buck. I attribute this to engine movement causing throttle changes by changing the length of the linkage path when a load is applied. This doesn't have any noticeable effect when the clutch is out.
On the other hand, the governor on fast idle doesn't produce "any" of the bucking, even with a heavy load.
Regarding clutch wear, we have .380" and .408" disc thickness after around 80,000 miles and we're nowhere near the rivets, yet. The worst thing that I remember doing to the clutch was climbing the coach rears up on high blocks at Ted Campbell's place when we were trying to fix a vibration problem. It didn't seem to bother him.
If I can get the coach moving without using the fast idle, I do. It normally works very well.
Tom Caffrey