LSD Auto LED grow

We've struggled with this grow since day 1 and now those struggles are showing their effects. Plants #1 and #3 have taken the worst of it, which i find interesting. Plant #2 was the one that i topped and it's handled the stresses much better. Day 57: - flushed plants with pH6.2 dechlorinated tap water, approximately 3 gallons of water through each plant (5 gallon pots) - Runoff from plants #1 & #3 reading TDS levels of 1400ppm! (tested first 500ml of runoff) - Runoff from plant #2 testing at 650ppm (tested first 500ml of runoff) - Plants #1 & #3 looking very rough, lots of yellowing/browning and dying leaves. Day 58: - no water - removed dying leaves from lower branches - it's possible that the flush *might* have helped... still early to tell. Day 59: - no water, soil still damp to touch - increased lower fan speed from 1 to 2 - removed 4" intake duct connected to A/C unit. The outside air intake has been sufficient to keep the tent cool, even a bit too cool during the night. - increased light intensity from 90 to 95% during the night to help off-set colder outside air temps. Day 60: - watered with dechlorinated tap water, pH adjusted to 6.3/6.4. Day 61: - light intensity at constant 95%, 18/6 cycle. - removed dead leaves from lower half of plants. - plant #1: buds look the weakest of the 3 plants. - plant #2: showing more trichome production. Plant seems a bit further along than the other 2. Bud density seems to be improving, but very slowly. - plant #3: buds still seem relatively healthy Day 62: - no water - noticeable increase in smell Day 63: - watered with tap water, pH adjusted to 6.4 - measured first 100ml of runoff. Plants #1 and #3 showed TDS levels of approx. 400ppm. Plant #2 was approx. 250ppm