For supplements, lately I'm using these:
CalMag- My well water gets weird in spring during snowmelt, and starts to resemble a very dilute and disturbingly pure organic acid solution... HELL on the buffering capacity of the soil, and only a couple mg/L CaCO3.
Stacker/SnowStorm/PurpleMaxx- They keep changing the name of the product but it's real nice stuff. I give it as a foliar so as not to interfere with soil chemistry. I have had mixed results with Humboldts Own products. This time around, my results are stellar. The plants look rolled in pixie dust!
Sweet- I use this at about 5-10mL/gallon along with some extra sugar from unsulfured molasses.
TopMax- Better product than Sweet, but more expensive by far, and overkill in my garden since I use the Sweet, molasses, and will on occasion apply Gravity. But I love TopMax and if you pick only one bloom booster, this is my top recommendation for especially newer growers, since it is pretty foolproof and works well.
Canna Boost- Everyone gets this- rooted clones, veggers, moms, flowering ladies. It just makes them seem more vigorous. I'm not sure that I'll go buy some; the shop guy gave me a free sample, but some outdoor people I know just ADORE the stuff and I am passing their recommendation along to you-all.
Note that I do not run high P bloom blasters as a general rule. I've got some Grotek stuff but have only used it a couple times. I feel that my standalone bloom fert is already giving adequate results, and I don't want to overdo the macros.