Getting there Dave!
I like the processing of the proms. I didn't spot the lower one in your image when I captured mine yesterday.
Looks to me like you have a little bit of uneven brightness. There's a hot spot just and right of centre (like you had a spot light shining on a ball from above and behind your right shoulder. I think that is just a matter of tuning the Ha filter to get a even brightness. That's help when it comes to mosaics
.
Your images also look to me like you are just slightly overexposing and losing the highlight detail on the disk. Do you use the histogram to set your exposure? I set mine so the white point on the histogram is about 225 say. Always have zero intensity at the RHS of the histogram.
Al.