i would start by getting cranks designed for a track
bike. the hollowtech 2 line is shimano's standard for
road, but the track line uses a octalink 109.5mm
bottom bracket. i have no idea what the chainline is
on the ultera 6600, but if everything else on the bowery
is spaced for a standard track setup (120mm spaced
rear and 42mm chainline hub) then its obviously the
crank/bb combo.

if you don't want to throw money into a new crank/bb
set, then measure from the center of the seatpost to
the center of your chainring. then respace/redish the
wheel so that the cog sits at the same distance from
the center of the rear fork ends.