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Hi Mook,
Are they oval in RA or in DEC?
You have a huge difference between you guider focal length and you imaging FL, a small, probably unnoticed variation before is now a few pixels at the longer FL of the C11.
It does sound like you scope is having balance issues at Zenith, it may be unbalanced ever so slightly the wrong way, so that the gears loose mesh whilst tracking, this then takes a couple of seconds to catch up etc...
Sometimes, with cameras etc hanging off the scope, getting the scope balanced is challenging.
It could also be a flexure problem with your guidescope, though I've never really used a guidescope, so I don't know what the symptoms would be. Someone else will be able to help here.
Cheers
Stuart
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