I thought I would do some more experimentation today as there were no clouds in the sky this morning. At least for a few hours anyway.
I was using my Coronado Solarmax II 60 BF10 DS. For this I thought I would try using the ZWO ASI1600MM-C via eyepiece projection. Focusing was very painful to do and while it's close I think it should be possible to do better (and work out why the left side is more in focus than the right side). It's just very hard to see when trying to manually adjust the focus and view the screen at the same time.
I took this using SharpCap and I know realise that the filename didn't capture the settings I used - I do know I was at -5C as I was wondering if cooling would make any difference (not really). I was also using FireCapture for other attempts with similar results and I'll probably go back to FireCapture in the future.