I find it interesting that you find Build a Bloom too hot.

I don't think I've really seen that in my grows.
I even add enzymes and bloom orientated bacteria to help with the uptake.
What particular ingredient do you think is the reason?
Could it be that I add humic acid to every watering that may help moderate/regulate uptake? It's not much at 1/4tsp to 5gal, but it's pretty potent.