Just a guess, but I think you probably overloaded the DR-07's (sort of sensitive) line input. In the manual, Tascam says the max line input is 6 dBV (~ 8.2 dBu). The TL has a sensitivity of 10 mV/Pa, so (if I did the math right) it would be outputting about -22 dBu at 110 dBSPL. Add in the 30 dB of gain from the V2, and (I think!) you'd be distorting around that point...
Maybe the reason the levels looked OK on the recorder is that the recorder gain is in the digital domain, so you were dropping the levels of an already clipped signal (brickwalling)...
Might be worth trying the V2 with less gain?