Vick I don't understand why you want to start splitting the A & B parts to your feed.. They are two different parts that together make a balanced feed for you plants.. Who is telling you to split them & just use B?? Certainly no DWC grower anyways.. Coz they're leading you up the garden path bro.. Use A+B together.. Period.
The plan doesn't completely nix out A. Phosphor (B) will be used in week 1 to promote root growth as I've read from different sources that the seedling needs it more at that time. At week 2, A (nitrogen) will be introduced and in week 3 (preflower), more nitrogen (A), will be used over B. During bloom, lots more B will be used instead of A, with nitrogen slowly being nixed out mid bloom. I'll look into using rapid start when the first leaf set shows up and the first roots hit the res. The last two times I used it in the seedling stage, it caused problems. I wasn't the only one.. Did some research and saw the same. Gonna play it safe on that.
As for scrog in dwc, I did provide a link to a grower that successfully got away with it, with many pics to prove it and his final yield was 8.4zips of a white widow photo from one dwc bucket and he had one of the healthiest, biggest, white rootballs I've seen in dwc. So..idk about 'not a chance'
I've installed a small pump, placed in a filter bag at the bottom of the bucket with a hose running out of the bucket. Tested it last night with the lid closed and it works like a charm. It allows me to siphon out the res water in about a minute without opening the lid. I can use this method every day to pump out a cup, to test ph/ppm. Gonna drill out a small hole for inspection at the top lid to monitor water levels and to refill water.
This method, if used with a scrog, will NOT allow me to open the lid after a scrog is fitted. I haven't set it in stone to use a scrog just yet.. as I've seen komach and others use a pretty cool small screen fitted to the lid for LST use. I'm just a little paranoid about my grow space getting cramped, so my bad if I've rambled too much on this scrog dream. I know it'll be a bitch..
Thanks for chiming in man