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I got a used C6 recently so I thought I'll share my (limited) experience too with the 0.63 reducer/corrector.
I was trying with the common 105mm backfocus at first and it is "ok" for the center but definitely far from perfect. CCDInsepector suggested 60% curvature.
I then stumbled across the 85mm as listed on Bintel's so I tried but it was definitely not it and looked pretty bad.
I'm using OAG too and it can very tricky with this setup due to how narrow the light path is on the C6, as opposed to C8 and up, as noted by many on the CN forums.
Another thing I noticed is when I was doing 105mm with filter drawer and the Baader Neodymium Moon & Skyglow Filter, I get much worse image, with or without adding the 0.3mm according to the +filter thickness / 3 rule. This is something that I still haven't figured out yet.
BTW these are all done with an ASI294MC Pro.
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