Great contrast Peter. Has a real 3D effect to it. Longer subs (and plenty of them) helps conquer noise of course. I was surprised at the difference between say 5, 10 and 20mins in Ha (although I have no experience on this one). With our weather as its been, you can't be blamed for playing it safe with sub lengths though. There's usually a rain cloud on the BOM radar somewhere in the neighbourhood lately.
Now you've got everything tracking so well dithering might be an issue (if you're not already doing it)?