I would bet the flexure is coming from the rear tip-tilt plate of the RH-200. The Altas should be able to support the CFW and Camera, but I don't like the mechanics of the RH tip-tilt plate. It's a thin piece of aluminum.
Your image looks very good corner to corner. Too bad it took that much mechanical modification to get this little bugger too work.
Everyone I know who has purchased this instrument knows the pain!
jg
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