I have a pair of 2011 malavitas and 2012 raiden phantoms, ride a pretty darn stiff board (T.rice HP,) and wear a size 7.5 boot, so maybe I have some helpful input:
The Malavitas are on the edge of rideable on a stiff board, but should be a little more rigid this year so should be a little bit more suited to a beefier stick. They're extremely comfortable, and if you're into freestyle they're very tweakable, but you definitely lose some response. The burton mediums don't seem to fit very well (they're extremely wide,) but the smalls are just about perfect, if a bit on the snug side.
The Phantom's are just adjustable enough to make my size 7.5 boot work, with the heelcup in its forward most position, I'm just barely centered on the board (DC judges and Ride Cadence.) I don't know if the fit is the same between the blackhawks and phantoms, but they may work for you anyway.