Lowering humidity during flower.

hey everyone. Im flowering a critical plus and a blue dreams. they are on th 5th day of flower and when the lights are on the humidity is at 30%. when they are off im not sure what its at but when I go to turn the lights back on and check the humidity its at like 50-60%. I have a Dri z air dehumidifier but its only the 10 dollar one and doesnt seem to be doing much. they are under 425 watts of cfl. (a 300w and a 125w) I have a 6 inch duct fan pulling air out but I keep my tent in a closet and when its dark time I shut the closet door for the 12 hours just because im afraid of getting a batch of hermies and wasting my time and money. they are in a tent that is 5 foot tall 4 feet wide and 2 feet deep. im not sure what to do to keep humidity down but buy a de humidifer. or possibly move the tent in my bedroom by a window but then im concerned about light leaks. What should I do? ALSO when I switched the nutes to tiger bloom is HELLA dropped the ph of my distilled water and I had to add alot of ph up just to get it to the correct ph but after giving it these new flower nutes by blue dream is kinda droopy and the bottom leaves are yellow! and dying but the top of the plant looks healthy. wuts that about? any info would help. thanks everyone. Id take pics but they are in dark period.

Better ventilation is the best i can think of (At the moment) to keep humidity down, without spending $$ that shouldn't be.

damn 200 views? and nobody but this 1 guy can say anything? How does everyone keep their flower room not humid!!!??
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dehumidifier or more airflow

i use a dehumidifier but only run it when lights are off. when lights are on, my ventilation is running bringing in outside air, so running the dehumidifier then wouldnt work very well.

so what is different during the plants night time?
1) lights off of course
2) closet door shut
3) ventilation is off?

if you could get a passive intake from your bedroom to the tent and then exhaust out of the tent would help. you may be able to keep the humidity down by having the vent. come on with a timer for a few times a night.

I wouldn't worry about 50% or even 60%. It means you will have to be more careful in your drying and curing process, that's all.