bruin water with a balanced light beer profile to get his ph correct
You're not making a balanced light beer, why use that target profile?
I think a bitter amber profile would be more applicable to your needs for a double IPA.
Also adding the magical pH 5.2 powder means the unaccounted needless addition of a lot of sodium and phosphate ions to the water. It truly is junk if the water experts are to be believed.
It is a product that does not and demonstrably cannot do what it claims to do.
Also 5.2 is not a target pH that will be to the benefit of the majority of beers.
- Ditch the magical powder. (well established as junk)
- Adjust mash pH with appropriate use of acid/acidulated malt/crystal or roast malts to target a higher pH (5.3 to 5.4) would be better I think for a IIPA
- Select an amber bitter profile in Bru' n Water or find out the mineral profile of Poland Springs and build to that target.