I have no idea what ascorbic acid does for pH - I only adjust pH when mashing. Ascorbic acid has been quoted as a O2 scrubber (antioxidant). Many people claim it helps minimize oxidation, although some say it's an oxidizer, so there's that lol. Personally, I'll continue to use it until I experience oxidation. As for hoppy beer, such as a NEIPA, hops are extremely volatile and react to oxygen and stale quickly. I think it's less of a pH reaction vs hops go bad in the presence of O2, so the less the better.