Critical Purple Auto

Week 2 of Veg. (Jul. 18th-24th) The Critical Purples have seen a lot of growth this week, even the runt. The R.H. of the tent was at 70%, so I wanted to start lowering it. I set up the dehumidifier outside the tent. Mind you, this set up is in an unfinished basement so it's usually pretty cool down there. It actually brought the RH to 53-55%, but it seemed to raise the temperature up a little and now sits at a steady 81F. I water only when the weight of the pots are noticeable light. I also began messing with some LSTing, using those small clips they sell online. I've read the ups and downs on them. I'll definitely have to keep a close look out. In the two last pics you can see that my dominate Critical Purple is staring to have issues. She's getting brown spots/blemishes and her leaf tips are starting to curl upwards. I read somewhere that the brown spots may have something to do with a Calcium deficiency. So when the plants were ready to be watered once again I added Cal-Mag and followed the 5ml to a gallon instruction on the back. The following day she seemed to have noticeable upward curling leaf tips. I wondering if it has anything to do with the sudden change in humidity, or the higher temperatures, or maybe the mix of the two. I decided to pull up my grow light from 25 inches to 31 inches and also brought the light intensity down from 80% to 60%. If I'm burning the plants or if its too hot hopefully that will make some difference. Might have to add some better fans. Or maybe a mini humidifier. Does it makes since to have both a dehum. and a humidifier? I had bought a double pack of black mini clip fans from amazon and not sure if they are doing the job. They were cheap, so I guess I got what I paid for. I have the oscillating fan but obviously not enough. Anyone have any thoughts or suggestions on these problems I'm having? Also I'm wondering if I should have already started some defoliation or Topping on the dom. C.P. yet? Do people here normally Top their autos? and if so around when do you finds the best time? Thanks.