For any of you that have been to the dyno with the SHO, these cars with any sort of tune are extremely difficult to lock into a gear for the dyno run. They like to downshift like crazy. Unless you electronically lock it into a gear, there isn't an easy way to keep it in gear. There could be a couple of reasons for what I gained.
#1 It downshifted and spiked the numbers (not likely). The dyno is reading that power band across the board. If it was a spike you'd see the numbers go up then drop down.
#2 My runs after the Livernois tune were low. I'm leaning more towards this. I have a video coming up (and I dont' have the numbers on this laptop) that will show the progression in the gains.
I hope this helps clarify things.