I've used Dg grow and bloom for a couple of years with pretty good results. I've heard it both ways, as you will too. I found this feeding schedule on here one day, and it seems to be accurate with the nutes I've tried.
View attachment 2497069 This is my THC Bomb @ 4 wks. --3 wks in veg (w/DG Grow) and 1 wk in flwr (w/Bloom)
This is last year's Northern Lights, about 3-4wks from harvest- 1 plant with her trunk and main branches tied down, running parallel to the ground. She was 8' long x 10' wide x 24-32" tall, and gave out just under 2lbs cured! DG Grow & Bloom. (How you like the camoflage? Guess it worked (lmao), I'm still here.
I know absolutely nothing about the SOS & the HC hydro Carb. Have you tried their website? Just guessing, the HydrCarb is a sugars/carbs/minerals supplement to use in the flowering cycle. They seem to love the extra sugars and carbs in the last few weeks of flower, and I've read that this boost can add up to 20% in size and density. I used horticultural grade backstrap molassis on my outdoor grows last year, and I'm sold. Don't know that it was 20% but it sure as hell didn't hurt!
Thai stick on the left, NYC Diesel on the right, still about 4 wks out. By the time the Diesel finished, she was over 9' tall and gave up a couple lbs. of mean!
I just changed my res water this morning and rebooted with BioThrive nutes. A good friend and his brother swear it's beter, so I'll try it in the hydro this year where I can monitor and control the conditions. But I'll be using the DG for my outdoor, until this convinces me otherwise!