New gear new challenges. Of course there are a lot of things to fix in that shot. Just take them out one at the time. The rig shows real promise.
I'd start with sorting out the field/tilt. You've got good guiding so that's sorted out. Then worry about what you're going to use to process last. IMO CCDStack is king with CCDs. I used to shoot with a Pentax and had to convert to DNG too which is a bit of a pain. Move to a CCD. Makes your life easier in the long run. There's a OSC QHY8 for sale right now.