I'm using equal parts Fox Farm Grow Big and Big Bloom right now. I'm at .57 EC, about 1/4 nutes. I'm gradually increasing the concentration daily as long as the plants keep looking happy. Also, I finally read my FF nutes schedule for comprehension and I should be using twice the amount of Big Bloom to Grow Big in the nutes I add, so I'll be using that ratio in the nutes I give over the next two weeks.
sounds like you got it down.. just always be looking for nute burn and you'll be fine