there is no product out there that will give you 'much' bigger buds than the genetics of the plant. I'd love to read that research paper, if it exists.
there are methods of growing that allow for greater cellular growth within the plant, but it is still limited by its genetics. Grow plants equally well and some grow donkey dicks, some only grow golfball nugs at nodes... simple as that.
we are more likely to hurt a plant when trying a thousand methods thrown at a wall and hoping something sticks.
in soilless so it is easy... feed a 650-750ppm mix of well-balanced nutrients and get 10-15% runoff each time... wait for top layer to change color, then repeat... always let runoff go down drain or toss it outside. If you want a good target PPM to shoot for, check out any of my diaries except the oldest ones. there is a table each week for PPM. I may make tiny adjustments based on observation of plants, but it's not ever far off from what you see.
your tap water may make Ca, Mg, S needs a bit different than mine.. i have quite hard water, so i have some Mg S and Ca at higher levels than most in my tap water. if you use RO, you very likely need a bit more of each of these than i do. mybe only be 5-10% but there is a high chance of different needs with different water. the npk stuff should be fine...
maintain 6pH as best you can... little under, little over gives room for error, vs shooting for "5.5-5.8" ... you drift to 5.5 or lower and you start having problems with Ca/Mg and such... sure, bombing it with more of each can ameliorate the lower pH, but then you risk lockout of other things.