I've had the precipitate issue with only a few bottles of bloom. It's from improper storage which means the distributor is probably to blame (unless your hydro store's backroom is so big that they can't afford temp control). You might want to call DG and ask them if the 50's is 'proper storage'. This could be your fault.
Before I buy a bottle of bloom, I turn it upside down and listen for chunks. Before I use a bottle of bloom, I measure its potency by taking 5mls and adding it to 1 gallon of RO, then I'll divide by 5. That gives me the ppm contribution of 1ml which should be in the 120's (.7 scale). I've used bottles as low as 90ppm and I've had bottles with zero precipitate that measured 125ppm. My plants did great either way but from a cost perspective, I want minimal precipitate. I'd suggest you measure yours.
In regards to 'cleaner' formulas, well GH definitely isn't. I never had any precipitation with GH but it's a salty formula. Given the same feeding levels, I'd get salt buildup on my pumps, on the sides of my res, and the tops of the GH bottles would be pretty crusty by the time I was done with them. Salts would also buildup to a greater degree in my rockwool which was measured when I leached my medium. The GH 3part is a good plant food choice but H&G and DG are a lot less salty.
EDIT: If the precipitate bothers you, don't use their bloom formula any more. I rarely use bloom in promix and I'm currently running a 'no bloom' grow in hydro by only using the 7-9-5 Grow formula. While it's too early to tell if the lower lower phosphorus levels will affect overall yield, the plants could not be any healthier here at week 3.