Amazing difference.
I find you need a shutter speed of at least 1/200 sec to get max detail. The earth rotation has an affect at speeds below that. Deconvolution kind of works but the images can end up looking a touch over sharpened.
Deconvolution is indeed not easy to get right. It's amazing what detail can be resolved out of the blurred parts using this technique. I never got a that detailed shot of the moon with the Tam, certainly not at 600mm.
It's a promising "sharpening" technique for all my shots since it does actually sharpen them. It'll only require loads of practice.
The 1/200s limit might explain why I got that many blurred shots at lower speed and it could have more to do with rotation than the VR.
Btw; a trick I also use when processing these shots is lower the contrast in post before adjusting luminosity and pull detail.