Cut a dieing leaf or allow to naturally fall

Hello I have a plant where some bottom leaves are yellowing/curling at edges and tips, one has a yellowish-brownish spot and they seem rough and dry. However, there are only 8 developed leaves, a new one coming in at the top and two growing in at node sections. Should I cut the damaged areas off are allow to continue to absorb all the light they can?

Also, I just read someone's post and realized I want to know what caused the problem and to give more info.
This plant was just placed into MG moss,perlite, & organic vermiculite (the perlite, and moss have liquid food on them, I couldn't find organic. This is a clone that was purchased with a brown organic substance that clones are placed in, already have this drying and spotting and curling problem before transferring. I have 80 watts/3900 lumen Flouros between 1"-2" from the tops. Temp varies from 79-88 degrees and a couple of nights were 92 and 94 degrees which apparently kills plants. And lastly humidity is between 40% and 55%.

What can ya tell me?

 

Cool I would like to add that the leaves began drying with browning spots before transferring into the soil. Since then (2 days ago) the spots are worse and the leaves seem dryer and rougher but the top leaves are fine and green.

 

They are about one month old

 

Since the post i have transferred both of my plants into huge rockwool blocks which I want to try to grow the entire plant in.

The first leaves were the problem at first but tip burn has gone on to the top.

OK I'm not sure if the plant is improving yet because new leaves that are developing already have drying darkening tips. Dark brownish blotches on the edges of leaves and now have orangish tannish spots running all over one of the five leaves, which was already severely drying and suffering from tip burn, and on edges on other leaves, some tan some orange some brown. These are the old leaves, new leaves have tip burn and are beginning to get a light greenish tannish color on edges near the tips) I have been feeding them only water for two days both through soil and foliar feeding and cut down to half strength solution today but haven't feed yet.
What are some ideas?
Can my plant still have nutrients running through it from being fed 3 days ago and only being fed water afterward?
Also, is flushing the (huge rockwool blocks is what I'm using now) with water and foliar feeding water at the same time bad for the plant? I wanna clean out the system but don't wanna drown my plant.