Hi Andy, sorry for the delay - been out of the country. I've been using HS81 on all surfaces. Plenty of torque even for 3D work. But they don't seem to center well and they appear to be rather "noisy" servos - I noticed increased radio interference when using them. Swapped out for another servo and the glitching goes goes away.

My choice, if cost was no object would be HS-85s or the mini JR digitals. To me, those are a little too expensive for this plane though...