Blue Dream DWC

Res change yesterday 12/28: 100% GH Trio week 6 formula, plus armor si, calmag and hydroguard. Still came out to 1180 so I added 10ml bloom and 10ml micro to 3 gallons of water, got it to 1230, so I'm ok with that. The pH was been rising/stable for about 5 days and then started nose diving. Really low at res change (sub 5!), But I had let it get really low. Looking forward to a day 21 defoliation and lollipop. There's definitely a lot of shag on this plant, I have been conservatively removing fan leaves to try to get some more air flow. I have a circulating fan to add (to the floor, so hopefully it pulls in more of the room air which is like 35% RH), but humidity is between 50-60 since early last week. Probably needs a bit of more fan and some defol. Top off system worked for a 2 days / 1 night. I pH'ed RO water + hydroguard, 8 liters of it. Pumped a liter at morning, 2 in the evening. Res was at 5.9 and just low when I got home. Jan 1, looks like a possible calmag deficiency I'm seeing, damn. Rusty spots and some discoloration. First thought is because of the dropping pH that it's not picking it up? I upped the res to 6.2 and I'll watch it. Jan 2, got a tip from https://growdoctorguides.com/ guy on reddit! The doctor suggests to tune down to 1000ppm and to defoliate. Awesome. Starting to second guess the cal mag deficiency, so posted here and on reddit. Jan 3, big day. Defoliated -- tent open long enough to get a lecture from my wife haha, must've taken me almost two hours. Res change, 85% week 7 GH Trio + 100% cal mag and armor si. Came out to 1011ppm, right about where I wanted it. pH'ed to 5.8. raised the LED lights a couple inches.