Problems with my 2 week old flowering plants

Hey guys, desperate need some help here. I have three plants in early flowering (GDP, white rhino, nirvana ice).

GDP had always had two lower branches with a large fan leaf on each end drooping. Other than that she was growing ok. I have since added a carbon filter to the inside of my grow area (see photos attached) and when I came home from work this afternoon, the whole plant was drooping down, and even the ice's lower stems also started to droop.

White rhino seems to be unaffected and still going fine.

I noticed the humidity which used to be around 60-70 before I installed the carbon filter, and now it is 40-50.

Also this morning, I placed the LED lights closer to the plants. Not sure if this or the humidity has caused the drooping. They haven't been over/ under watered, and a bit more of my grow is detailed below. Please check out the pictures and help me work out what is happening here.
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Grow area size: 820mm(long) x 310mm(deep) x 1700mm(height)
LED UFO x2: 135w, + 180w
Light organic soil with slow release nutrients (in 140mm pots)
Bio bizz organic nutrients (started after 2-3 weeks of veg) and they responded well to them.
Soil Ph: 6 - 6.5
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Please help.

ok, so it turns out I watered them and GDP went back to looking much healthier (only lower two branches sag once again), Ice seems to have stayed the same (lower branches drooping), and white rhino is still looking good. A little bare, but no problems.

Should I cut the lower drooping branches on both ice, and GDP? or is it too late going on to third week of flowering?

Don't cut off anything ..the fan leafs are energy ..sugars and stuff are stored in them...i don't know about led but if leaves are not getting light down low under hps they will droop...they will be drinking more aswell now in flower..they look grand..happy growing

The GDP just needed water. The drooping of the old leaves is probably from them not getting enough light. The plants may do better if you get them closer to the lights.

they look nice... dont cut anything off