Awesome seeker!!
The longer exposures has reduced you noise a lot! It's interesting to compare Scott & my M20 images. Scott does real long exposures, but only 2 or 3 where as I do many exposures (~30) but for short durations.
The dury is still out, but to me it looks like it doesn't matter haw you get your exposure minutes, but just as long as you get them!! Eg 30x4mins is almost equal to 4x30mins!! Interesting...
By the way how do you like the CLS filter? I am thinking of getting one. Tossing up between that and the Baader UHC-S filter.
Keep up the good work.
Cheers