I love the TVS2300 on my Denali XL. She is pushing around 750HP and has no issues getting up to speed from a freeway onramp. That being said, I do think that the TVS2300 is a bit overkill for the 6.2Ls, as the TVS1900 seems to be a bit more efficient on our 13 Silverado (6.2L).
What do you have in addition to the tvs2300 and a tune to get to 750 hp (I'm assuming that's estimated crank)