maybe the spark plugs need to be re-gapped as the flame could be getting put off from hight boost... or even need new spark plugs..
does the check engine light come on? the hesitation is defenetaly to do with the electrical side cos when my one went to check engine mode, it hesitated lots.
also, what computer are you using - maybe swap and see if makes a difference?
what sort of boost controller?
also, fuel filter - is that sweet and maybe do a fuep pressure test to make sure that is sweet..
just few things to start off..
the v7's are pretty good so has to be something small