I don't want to digress too far from my original request to hear from other owners but here are some answers----
1. The two crops shown are different because I rotated the camera 90 degrees. In both cases the elongation is parallel to the RA axis.
2. The pier rests on a 48x48" block of concrete/rebar isolated from the rest of the observatory. I sit in a separate room. The wind was zero (I have my own weather station.)The stars were round with my Tv127 only two weeks ago. I have even lowered the pier by about 6" for better stability. So, while nothing is proven vibration would be a real long shot.
3. The scope worked well on the Paramount previously - no elongated stars with good guiding. Anyone can get oblong stars with bad guiding, getting them with excellent guiding takes some underlying issue and with the OAG bolted directly to the integrated camera I'm ruling that out.
4. I can't take rapid cadence main camera exposures and the guide camera seems to have round stars due to the image scale being 4x larger (smaller?). The jitter is a fixed value like .4 arc seconds I'm betting so it only shows at fine image scales. .
I was able to speak briefly to the head of sales at iOptron today. I got the same kind of hand waving from him about the problem. He did say that he was aware of a problem with these mounts and that they are "working on it". Given that the mount is 15 months old, and they have known about the problem for at least a year (reasonable guess) it's unlikely that they can suddenly solve it. They have a bad design and "working on it" this long doesn't bode well for getting it fixed.
You know I can't understand how they can still be advertising and selling a product that they know doesn't meet it's specs. Moreover they've been doing it for maybe a year or more. People save money for a long time to buy equipment like this. iOptron has always treated me fairly - this is my third mount from them. So this behavior has me baffled.
Anyway, I'd really like to hear from others who have the mount and do or do not have what appears to be an SDE problem.