Never heard of Agent Bulk, however looking @ those two, the numbers are really high, be careful with all that.
Bloombastic is good with any base nutrient.
If you do choose to mix them together you can do it like normal. Or if you follow one of the threads on here, they recommend mixing each nute in its own gallon container for example, at the dilution ratio you need, then adding them separately into the main res.
I really don't see much point in using both though to be honest. I would recommend using agent bulk on 50% of the grow and bloombastic the other 50% and see the difference.