Zkittlez auto vs Gelato auto.

After lowering my EC from 1.5 to 1.1 last week due to tip burn, 6 out of 8 started to loose a lot of colour, lower leaves yellow and top leaves pale green so not getting enough nutrients. Been struggling with heat, could be stress and ph out. I checked ph and it was pretty low. So I’ve addressed heat issues, upped my ph and upped EC to 1.6 and they are looking much happier. Changed light schedule to 16-8 so they have more recovery time and adjusted lights so they are still getting 45 DLI. Day 56. Taller plants showing light stress on leaves so upped calmag to help with potential deficiencies. Heat had stunted bud growth a little, hoping now temps are good this week they’ll pack on size. Day 59. Washed the water tank out and put them on plain PH 7.0 water to raise the PH a little, it’s sitting round 6.2-6.3 in the pot/root zone. Maybe why I’ve had the chlorosis on the leaves. phosphorus Deficiency due to low PH? I’ll put them on their feed again tomorrow and start bud boom and keep PH around 7.0. All trichomes are milky so maybe 2 more weeks? One week (ish) on feed. One week (ish) on plain water. 3 days no water no light. Chop. Really want to let them go as long as possible for some good weight. Probably 40% amber.