outwest
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K and P issues. Reddened petioles = P problem.
Mid-plant leaf necrosis usually = K problem.
I often find that K problems occur concurrent with P problems.
That kind of curling could = a Mg problem, but I've never seen it as a result of Mg-/+.
When the RH is 50% your VPD is 1.58 kPa (kilo pascals, don't ask me to explain WTF that is). When it's 60% your VPD is 1.26 kPa, much closer to the ideal VPD of .85. Bump up RH to >60% or get the temps down a bit. I prefer and get better results from bumping RH up.
Read, remember, bookmark: http://www.autogrow.com/vpd_calc.php
Oh, let me post up my Dx flow chart and graphic. Simplistic, but helpful. The curling itself you might want to Google on, use ONLY the .edu .uni .gov etcetera type of sites, NOT cannabis sites. Seriously.
God damn it. I got ONE file uploaded and now it won't let me upload another one? Son of a *bitch* this shit is kludgey.
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