I finally had a chance to mount my 11" Edge SCT on the CEM70 last night. I wanted to see if it will be realistic to image with a 0.7 reducer on the Edge. I made sure everything was balanced and it looks like I have an issue with RA spikes that occur in intervals same as the worm period. Additionally, I mount would sometimes make a bit of a sound when the mount would either start or stop slewing (different from the "normal" noises). Slightly freaking out, I then mounted my Skywatcher Esprit 100 ED scope to the mount and ran a short guided session. I was unable to see any of the spikes in this short period. I routinely guide at around 0.6" RMS with the CEM 70 and the 100mm refractor. I did tighten the belt on the RA axis last week since it was a bit loose. I may have tightened it a bit much? Not sure if an overtight belt could contribute to the RA spikes. Note that the moon was nearly full and seeing was pretty back last night.
I understand that guiding the larger scope is more challenging, but am at a loss for the RA spikes.
Please let me know if you have any experience with this and if you have any suggestions. I've attached screenshots of the comparisons.