Please help my girls are sick

Im 4 weeks into vegging some Tahoe OG and I'm running into major problems.
Nitrogen toxicity.my plants turned dark green and curling up. What do I do..?

Im running an ebb n flow under 1000 hps.
Two part sensi ab for veg by advanced nutrients.
I use RO water . My ph starts @ 6.2 but climbs after every feeding . I adjust it to keep it around 6.2 the best I can.
my temps stay 85-92 lights on
77-80 lights off


One plant is so weak she fell over . Today was day 30 so I need to switch before my plants get too big.help!
 
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