You and others refer to running the tractor at "full throttle" or "all out". Do you really mean that? Or are you referring to optimum PTO rpm? I have a hydro. PTO is about 2400 RPM but there is more throttle available. Do you think I should periodically run it at max RPM?
OK, you said you wanted something thin, but...
I bought horse stall padding at Tractor supply. Comes in 4 X 4 ft square.
It is HEAVY duty (use for horses) but sounds like it may work.
Good Luck!