LSD Auto LED grow

As a reminder: Plant #1: received LST on regular basis during veg, moderate defoliation. Plant #2: topped, occasional LST, light defoliation Plant #3: occasional light defoliation only Plants #1 and #3 continue to show moderate nutrient deficiencies. I suspect possible lockout but my runoff tests at pH 6.4-6.5. Plant #2 is the healthiest looking of the 3 but is very dark green... excess N? Day 43: - watered with Remo Nutrients flowering combo @ approx. 60% recommended strength. Day 44: - no water - increased QB96 light intensity from 65-70% - moved lights up 1-2" to maintain distance to canopy - plants #1 & #3 continue to show deficiencies Day 45: - no water - I might flush these plants later in the day today but I'd like the pots to be a little more dry before i do. I've put a small, 9-inch fan at the bottom of the tent to circulate more air around the pots. Day 46: - Picked up some new pH calibration solution & calibrated my pH meter... which was off by 0.4pH! - watered/flushed the plants with approx. 2 gallons of 6.2 pH-adjusted de-chlorinated water each. - runoff testing at 6.8/6.9pH, which is exactly 0.4 higher than i was testing it at, due to the calibration error. - plant #2 is not nearly as badly afflicted as #1 & #3. Day 47: - no water - temp spiked above 82F for 4 hrs Day 48: - no water - temp spiked above 82-84F for 4-6 hrs - A/C hose hooked up to tent, replacing the "room intake" duct to provide more reliable cooling. Outside air intake enters at bottom of tent, A/C duct enters at top and is pointed at QB96 light fixture. Day 49: - lightly watered (.5 gallons ea.) with a very light nutrient mixture (20% recommended amount) using only Remo Nutrients: Bloom, Astroflower, Nature's Candy and MagNifiCal, pH adjusted to 6.2. - trying to avoid adding too much Nitrogen