Hey DC !
Hope you are feeling better now.
Being a rotary guy from another planet, I bought a 3401VRG from Angelo, years ago, when they first came out and immediately put a side handle on it, like I have on my rotary.
Never liked bail handles, would rather use my hand on the head of the machine instead of a bail handle any day.
The machine does rotate counter-clockwise, so your hands had to adjust to that, and maybe they were a little upset that the constant pressure was now hitting them a different place then the normal PC or Rotary rotation..
I hardly ever use this 3401VRG for anything except some selective finishing so there is less hard work for me or the machine, and for sometimes applying a glaze or polish or something with the finest L/C Hydro-Shred Pad out there today.
I actually like the 3401VRG better with the smaller 5.5" pad/backing plate combo; it seems to be easier to handle, and I guess it would be able to do the work including rotation faster, since there is less mass to move around.
Glad you have one, its a great, versatile machine, and can do a lot of good.. It will heat up pads faster than you think it would, (at the higher speeds) so keep that in mind..
Take care,
Dan F