Sorry, correction. OG is 1.117sg/28brix (not 22.5 brix)
I didn't measure the volume of what I added. I just topped up to 1 gal marks, maybe .25gal each. I just sampled again and it's now 11.5brix (down from 13brix)
Is brix linear in that if I diluted by 1.5brix I could adjust my OG down by 1.5...