I wouldn't trust a big OTA like the C11 to the standard puck, especially if you are using the smaller dovetails too.
I've upgraded mine to the ADM. Pricey for what it is, but it makes a heck of a difference. Although I haven't tried DSO imaging on the C11, i do feel that the EQ6 is on its limitis with a such a big OTA. The slightest wind will cause it to move, though if you are in an obsy then you would get a lot of protection
Michael: Don't want to hijack the thread, but noticed that you have the EVO counterweight shaft upgrade on your mount - has this been a worthwhile upgrade?
I'd also be interested in this. Again, it looks like an expensive upgrade, but the standard counterweight bar on mine "flops" at a certain angle.
Scopes: Lunt L60Tha D/S with BF1200, Celestron C11, Equinox 80 APO Pro + TRF-2008
Cameras: DMK21au618, Chameleon mono, Atik 428EX, Starligh Xpress filterwheel (DSO rig) Xagyl FW (planetary rig) and Baader LRGB
Mounts: EQ8, Skymemo portable.