Round 2, Grow! Hindu Kush auto (freebie)

Week 7 Day 44 (12/22) She will be ready to feed today or tomorrow. I'm worrying about the yellowing I am seeing. It seemed to start low but now is heading towards newer growth. Seems like a nitrogen deficiency, but this far into flower, IDK. I think I will bump up her nutrients to full strength, I've been at 75% the past two feedings and she seems to take that fine. I will start "Flower week 4" on the House & Garden schedule. I'll probably add in some Cal-Mag as well, in case the yellowing is from a deficiency there. I'm thinking it may be low (also?) because of the yellowing but also some small brown spots have started to appear on a couple leaves. Day 46 (12/24) After feeding her the other day, she has become pale and yellowing all over! Idk what happened, but it happened pretty quick. I may do a small flush today, let her sit, and refeed her at 1/2 strength. Day 48 (12/26) I didn't do the flush, at least not yet. The yellowing seems to have stopped progressing. I'm thinking it was a magnesium deficiency, as the yellowing had started quite a while back looking like it needed mag. I think it just took it awhile to get past it and stabilize. I am watering her today, may go ahead and run like 3 gallons through her to give her a little flush to try and clear out any residues.