I bought an AP130 EDT f/8 on a GM8 that used the G11 dovetail plate. The
mount is barely adequate for that setup. Breezy conditions made it shake
pretty good and rap test settling times were in the 5 second range. That's
makes focusing a challenge as well. I have the same OTA on an AP400 and it's
more stable. However I also have a G11 and it's the cat's meow for the OTA.
It's not the weight that's the problem. It's the torque produced by a
refractor's length.
You'll be MUCH better off (IMHO of course) in the long run with a G11. It's
more versatile in that you can mount all manner of scopes on it in the
future.
Clear skies,
Jeff