Bubbleponics - O.K.C.

Notes from 8/27/2024: For the first day after the water change on 8/22 the PH climbed, and the EC dropped along with water level.  I thought things were fixed.  However, by Sunday 8/25 the PH was dropping again with the EC hovering around 0.7.  The water level was particularly low so I believe I added two gallons.  On Monday 8/26 I added another two gallons (I can't quite remember).  This got the EC to 0.5, and I bumped the ph up to around 5.7.  As of that (Monday 8/26) evening, the PH had climbed to 6.0.  This morning the PH was at 6.2 and I left there, adding an additional gallon of water.  the water level now seems to be about where it should (I forgot to measure the exact water level after this last water change on 8/22 so I'm guestimating here).   Based on the above, 50% Jack's is still to much right now.  I'm guessing due to the high respiration?  It is consuming more water than any other plants I've grown, but damn....   The right plant is basically in bud stasis with a few foxtails growing still, and leaves deteriorating steadily.   The left plant is making more progress, but not what I would expect.  I'm thinking after all the issues the yield has been diminished.   Still about ~ 2 to 3 weeks from harvest if I can keep it going for that long.  I'm thinking next water change I'm going with maybe 35% Jack's. Notes from 8/29/2024: Water Change:   40% Jack's 420: A = 24.0g @ 15gal B = 12.0g @ 15gal PH = 5.7 EC = 0.7   PH started to rise (after it had fallen below 5.5) after EC was at or below 0.5 in this last week.  The plants don't seem to like being above 0.7 EC as far as I can tell.  It just seems like such a low EC.  I am trying to keep the humidity at ~50%  so maybe the higher respiration is causing this scenario is the only thing I can imagine.