Love the image scale, it's huge! 630 frames is a lot to stack! Especially if the seeing wasn't 8/10 or above.
Can you try stacking less?
What i've been doing lately, is when I create the reference frame, I process the reference frame a lot harder (4->15, 3->10), and then after optimise, I find it really does a better job of ranking the best quality first, so in the stack page I drag down to about 100 and stack that. It comes out a lot sharper than stacking more frames, which tended to blur the minor features a bit more.
That's a marvellous image and i'm sure it'll come out even better after you do the split jobby.
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