I was quoted at 260 with that setup, except for the addition of an STi bottom end and headers. That was what a reputable tuner said is common for my setup(pdx tuning, mustang dyno). So I'd say 230ish sounds about right.
It's very strange that you would only net 5 hp, and lose 2o tq. I definitely would have gone to the same tuner who was able to get you 70 horse out of a catback. That guy sounds amazing. Maybe this IS just a bad tune...
355 awhp fp green six speed wagon in Corvette Atomic Orange