Stop using Superthrive during flowering, as I hear it has a fairly undesirable Nitrogen content. I only use that stuff when I'm rooting clones, and even then, I use it very sparingly. 1 drop per gallon, as the bottle suggests.

And Orzy is right, you'll want to make sure you start out with a very diluted feeding regiment with the Monster Bloom. Start out at about 1/4 the recommended dosage, then gradually work your way up until you start noticing the plant telling you it's enough. Sticking with a strict (and diluted) bloom regimen is key to a successful harvest.