Hi Dave,
I am thinking some of the things that could be going on right now is your polar alignment is off. Focus could be tuned up a bit. I can't immediately nail down the color issue. Is there any point in any of your shots that you see some red, such as before you put them in Registax.
I take it that it's a Meade DSI Color, or are you using filters on a monochrome CCD camera?
If others can comment that would great as I am no more an expert or have any more experience than any of you when it comes to Astrophotography. I enjoy these threads as I like learning and hearing everybody's comments, it's not uncommon to pick something up that you hadn't thought of or heard before that can suddenly transform your shot into works of art, well almost
.
Regards,