I had a few Purists but had to leave them go to drop down in weight and now have a few Visions. As far as I can tell, the older style Mystical and Purist were of the same r/d design, but the Purist had slightly narrower limb tips and fancier wood, clear glass. If the two 2007 bows that I have are representative of the current longbow offerings, I detect two minor differences compared to the bows that were made a half-dozen years or more ago. The risers are just a tad fuller/chunkier, and there seems to be a little more reflex in the limbs. Excellent performers. Mine are both bamboo cored 64-inchers, one 52#, the other 58# at 28. Bamboo cores make for a smoother draw, but few longbows will draw as smoothly as a recurve. That's not how they're designed.
Terry, what you have in mind should work quite well. Another two inches in length would draw even smoother. Either will likely draw a lot smoother than an ML 10. The few of those that I've shot stacked like all get out and kicked like mules.