Hey, as far as the Big Bud goes, it's an additive, not the whole package. I'd use with SensiBloom or Conniseur, I believe starting second through the fifth week of flowering (try the advanced nutrients calculator, I could be/probably am wrong) Advanced Nutrients - Nutrient Calculator
It's really simple, just change reservoir size to however much water you're using, what kind of feeding you want(ie light, heavy), and the flowering period of the plants and they'll recommend when to use it. I say WHEN to start using it because every plant is different, so I wouldn't just go off their chart for amounts...

Try the B-52 for midflower if you're pushing them hard. The Overdrive is the last of the AN bloom additives I use, but you could honestly probably just use Big Bud instead.

Good luck :]

Oh, thanks for the tip about shaking nutrients Rusty :thumbsup: Mine are a year and a half old, is there any way to tell if they're still good? I have AN and Botanicare.