I started out with the mindset of using just Aqua Flakes A&B and Drip Clean but soon realized that my plants needed more. I recommend the entire lineup, that is what I am doing and the plants love it so far. Much better than just the A&B. Also, if you do DWC and make a tea, which is recommended, you can add the Roots Excelurator to the tea before brewing to get more out of the RE. It will multiply the good bennies in the RE and you can get away with using less RE. At least that's what I am doing and it is working out nicely. Check out this thread on brewing the tea -
https://www.rollitup.org/dwc-bubbleponics/361430-dwc-root-slime-cure-aka.html
P.S. - H&G nutes run strong so I recommend starting at 50% A&B and going up from there. I burnt my girls early on and it stunted them and made em look shitty but they are much better now.