Aqua Man
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So yeah humidity is still a bit high for stage of growth. This can cause calcium issues also as transpiration is directly connected to nutrient uptake rates. Im not saying this is absolutely the cause but it sure doesn't help.I’m like two weeks into flower and my temp is averaging 75 and my RH is 55. I have a HLG 600H in both my 5x5 and 4x4.
It's also relative to temp. Under LED you wanna try to get up around 80f room temps. This will bring leaf and root temos up increasing metobolic rates and increase growth rates. Then adjust humidity last.
If ya can't bring the temps up not a huge issue just go by the VPD calculated at 5f leaf temp differential