I have a 13.5 kahoona and a 2010 16m crossbow.
the crossbow is a better light wind kite
the kahoona boosts very well in higher winds, about the same as the crossbow.
the kahoona turns about 3 times faster. the crossbow is better upwind. the crossbow has a way better wind range.
the kahoona kites are OK IMO but i am not sold on the missing center strut kits as they flap more than center strut kites.
you are asking about light wind kites that boost, this is a hard question because you can't realy boost in light winds.
you may mean a light wind kite that boosts when the wind picks up.
depending on your weight and lightwind board choice you have choices.
if you are lighter than 200lbs and on a large twin tip you could go either kite.
if you a heavy guy like me at 225lbs i find the kahoona a little underpowered in light winds with my 6'5' surfboard.
i take my crossbow 16m or my speed 3 19m out.
when the wind picks up i grab the kahoona 13.5 v2
i haven't tried the epic kites but i would say the largest screamer would be a better all around choice over the kahoona.
i am impressed with the turning on the kahoona and not much other than that.