If you're talk about the bloom boosters with the crazy high P and K values and zero N, I don't ever use them. There's no need to give the plant a huge dose of PK in bloom if you are feeding an adequate level of a decent bloom feed in my opinion. I've tried them when I was using salt nutes and at anything close to the recommended strength they caused really bad tip burn and stressed the plant. I think just trying to keep it healthy and using a balanced bloom fert is way better for it overall.
Now....where did those Blue Dream seeds come from? I'm really liking the way that plant looks and I love Blue Dream for daytime use. Thanks