I was finally able to complete a test run in Ha last night. I have put the details of the test in my Mono Camera Build thread here:
http://www.iceinspace.com.au/forum/s...82#post1238682
and the short stack of subs (8*300") have given me this image posted in my Astrobin gallery:
http://www.astrobin.com/full/243048/0/
The results are encouraging, and clearly dithering and DSS have eliminated the sensor artifacts that were troubling me. Looking forward to more clear nights to work on narrowband.