Be careful with superthrive during flowering, it has been known to interfere with the flowering response. Personally I only use it at transplants and sometimes when starting new clones.
I've had a few people give me that warning and then had a few others swear by it all the way through flowering. When I start my next batch (all clones) I'll experiment by giving some of them ST and some of them just plain nutes and find out for myself. Thanks for the heads up!