I use a CCD recently and got massive difraction spikes as well. My avitar is a culmination of filter to reduce the light. I also have no tracking as well which alter the final outcome.
My final configuration was IR Filter and double polarising filter adjusted.
I am going to try another method later when the skies clear up.
The DSLR may require faster shutter speed as it looks like you have too much light coming in. I can't help much though if using lenses.
BTW I am a newbie as well. I my advice maybe off a bit.
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