Joe looks good to me. Looks like you found reasonably priced bits to use and they did a good carve. The air-water cooling system you found looks like it would also help improve on the granite work. I think I would try to keep the stepover around 10% and mess with the other parameters to help keep a smooth 3D cut. You might also make a tray from plastic with a flat bottom to get rid of the flexing or make something to go into the tub that rests on the low portions and supports the work.
Joe thanks for posting this. Looks like you will push the limits of your new machine and then some. I look forward to seeing how far you can PUSH those limits.
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