How do you guide at F10? I'm hoping that my guiding rig will work at 1400mm-- I just assumed it wouldn't at 2000mm-- so I haven't given it a shot yet. My rig is a QHY5 with a small scope (50mm) held by beefy ADM rings attached to a dovetail bar on top of the Edge8. In the back of my mind I have the feeling I'll have to go the OAG route. I did purchase a FeatherTouch micro focuser for scope and it work beautifully.
With my WO66/SSAG, I've been able to guide my Edge HD 800 up to 8m. After that, there is some drift that becomes too much. I believe it is flexure from either my mounting or focuser. I have heard of people guiding at 5:1 with the Orion 50mm package, but I don't know about at 2032mm. Based on my experiences, I was surprised that people were able to get good exposures when pushing the 5:1. I hate being right at the maximum, and the F10 will be well over.
Last night I finally got my OAG working. This is after much struggle, but now I'm reasdy for the big league. I cannot wait until I get to image with it for the first time.