Nope:
EDIT: Here I am at 16k feet, in the MD 500E, and still climbing at 2500ft/min. Same control profile. This is with about 85% collective currently, and it’s not into the orange band of torque. I can make it spike higher if I pull the collective to 100% so it’s not my controls. All other copters are fine.
Experiment continued… got up to 27k at 100% collective before it wanted to fall 
