I did see one article, specific to e-cigs, that said that flavor was better at lower pH. It gave a range of 6-8 pH as the best range. I didn't link that article because pH is measured on a log scale, which makes that range kind of freaking huge. I want to keep the stuff i inhale into my lungs a little closer to physiological, at a guess, maybe 6.8-7.6-ish.
