Mike,
(FROM another Mike) I too use MeshCAM Art. To critique your work (although VERY Nice!) I have learned that Pine is pretty much a waste of time, and material. It just doesn't hold up for much carving details without chipping, splitting, cracking, or breaking off. Oak is a much better material to work with. And regarding speed- even though a machine may be capable of faster speeds, this does not necessarily improve things.
But can instead, make it even worse -even if cutting Oak. The reason is, the cutter needs TIME to do it's thing. Sure, you can speed things up to 60 IPM feed rates, with a router running at 27,000 RPM, but it will result in the cutter just Knocking the wood instead of actually cutting it. (Think hitting it with a 27,000 RPM hammer!). I usually do my roughing cuts at about 40 IPM, with a 1/4" straight flute bit. And the finishing cuts at about 22 IPM, with a 1/8" single flute round tip bit. And for really fine details, a 1/16" carbide tile cutter bit.
Patience is the key to getting good results with MC Art. Most of my carvings average about 5 hours total cut time, depending on size, depth of cut, complexity of the shapes edited, etc. I have just finished the tool path for a carving which measures X=21 Y=10 Z=-.75 and the estimated cutting time for that piece is over 12 hours! Have a look at the Marine Corps logo for an example of my work (approximately 9x10).