I have a feeling this will be a great beer. Hopefully I have found and solved my issue so I can get back to being excited about brewing again.
If all goes well with this, I plan to make an IPA again. One thing I will start doing, especially for lighter beers, is to use a Campden tablet.
Do Campden tablets alter my Bru'N water chemestry in any way? I would assume not, but I want to make sure.
Good to hear you're making progress!
Note that a campden tablet has nothing to do with lighter/darker beers. Its only purpose is to neutralize chlorine/chloramine, which it does immediately and very well. This won't really make an IPA-specific improvement unless you're getting chlorophenols, which is a pretty recognizable off-flavor and would exist in all beer styles.
I recommend trying a test batch using distilled or RO water and adding salts per Bru'n water. That way you'll know first off that you're free of chlorine/chloramine, and second off you'll be able to build the water profile you desire for an IPA.
I think you'll be pleasantly surprised...