You could try the Fox Farm trio of bloom boosters. Open Sesime, Beastie Bloomz, and Cha Ching. I've never used Fox Farm nutes, but I've read some good reviews on these products along some complaints. The main complaint being that some say Cha Ching leaves an aftertaste they can't get rid of. But a good flush with Sledge Hammer or any flushing agent, I wouldn't think this would be a problem. Most people agree they do make a difference in yeild. As for flavor, you could try one of Botanicare's Sweet formulas or General Hydroponics Flora Nector line. Personally, I like to let the natural aroma and flavor stay, but each to his own. Hope this was helpful.
Happy Growing
