Hi Zernike Polynomial (nice!)
I have no problems using this mount with my 8" SCT. It sort of looks like a 200mm newt with the dew shield on it.
On top of the SCT, I have my 80mm APO riding piggy back plus cameras on both scopes.
My total equipment weight is 27 lbs and I have 27 lbs of counterweight as well.
If the seeing is good, I can guide to about 0.5" RMS in PHD.
Mounts: EXOS II PMC-Eight, LXD75
Cameras: ZWO ASI294MCPro, ASI385