I'd give Nebulosity another look.
There are some great tutorials and documentation, which as you say, is unusual!
http://www.stark-labs.com/movies/Capture_Full.html
The nice thing in Nebulosity is that the images *do* jump out at you, as there is an auto black/white point setting (auto scale) in the preview screen (doesn't affect final image) that lets you see what you got.
The capture part is all explained really well in the video above, along with multiple exposures etc.
Then for post processing basics:
http://www.stark-labs.com/help/nebul...cHowTo_v1b.pdf
There are even the fits files on this page to practice with, so you can have a go before imaging again.
http://www.stark-labs.com/help/nebul...tutorials.html
Anice walkthrough of pre-processing is here:
http://www.stark-labs.com/help/nebul...rough_comp.pdf
and the detailed version is here:
http://www.stark-labs.com/help/nebul...sing_HowTo.pdf
BTW, for that camera the gain is 1 and the offset is 111 in Nebulosity.