8411HV works just like normal 8411SA that we have been using.

I have 9411HV, 3711HV in my Mystic including the 8911 like Tony used. Yes 8911 totally is an overkill.

you will not be disappointed with these servos. I just replaced 3711 gears to 3121 plastic gears (total of 6 grams drop from both stabs).

thinking about changing gears on the 9411HV also.