Please help! 1st time grow just going into week 8 flower problems

Hey everyone! I am new here as my 1st baby is almost done! Here's a little list of the info.
-indoor 7x7x10' closet grow
-mariposa california
-Girl scout cookies
-very well ventilated with 4 fans including one air filter that blows hard
-growing in a 5 gallon pot with fox farm ocean floral organic soil
-used only fox farm big bloom nutrients with only light/medium feeding
-humidity has been 30-45% the whole life of the plant except in the last week where humidity has risen to 50-65% fluctuating.
-80 degrees during light cycle and goes to 65-75 during night
-400wat hortilux HPS metal dome light about 16 inches from top of coli.
-plant had minor bugs from soil when I first got the bebe clone but I sprayed a neem oil solution all over it about week 2.5 vegitative. Neem oil eliminated all problems and the plant has been healthy as it could get until recently.

Now there has been some things happening I am very worried about and I have included the pictures below.

So first off recently where leaves have been touching eachother, the top of the leaf where the other is on top of it appears a rust looking splotch. I was freaking out about mold but it does not seem to identify with the well known ones. Also these spots get very dry and I can crack the leaf in half where the spot it by bending the leaf.

Second is my top coli fan leafs. I noticed some very slight bleaching as i thought my light was too close (about 8-12 inches) so I raised the light to about 16 inches. But then I flushed the plant and a day later they look very bad, does not look like the usual flushed yellow fade. All of the lower fan leaves look absolutely perfect green even now 5 days after the flush. Just the main coli leaves look bad!!!

Third is also some of the bunched up leaves(2 or 3) have these weird bumps on them and they do not look very healthy as they are curling like upside down canoes!!! Please help me thank thank thank you allllll very much!! Much love!!!!

if anything more is needed i can go more in depth and take better pictures! thank you all so very much for the time!!

The brown spots from where one leaf lays on another is caused by the moisture given off by the stomata on the underside of the upper leaf being trapped. The bottom leaf gets the damage. I call it "leaf sweat".

From your dark green leaves and the burn shown I'd say you have toxic salts buildup. It's usually a combination of too high nute levels and mineral buildup from less than pure water. I'd do a 2 or 3 volume flush and force them to feed off their own leaves to the finish. I've had it a lot due to my chronically low RH.

Good luck!

Oh my gosh OldMedUser, i cant thank you enough. I was unable to find anything of the sort online about these! I have been using well water and i have no idea what could be in it!! Tomorrow morning i will go buy a bunch of good water from the store to flush again! with the flush... so i watered my plant last night with the well water 24hours ago so i might have to wait another 48 hours until the soil is dry enough? or can i just flush it tomorrow morning? soil is damp a quarter of an inch down at the moment. scarred of overwatering as i did in the very early stages. one day i hope i can help you brother!

Don't wait.

Do the first volume with your well water and the second one with RO or distilled to really leach out the salts. If you have an airstone and pump aerate the good water for a couple hours at least before usin so it's as charged with oxygen as it can be. If nay to that then pouring from a few feet up back and forth into pails can do the job adequately.

By volume flush I mean use the same volume of water as the volume of dirt in the pot. PITA I know but you gotta suffer for those you love!

A wet/dry vac helps to remove water from the drip trays. The
water goes thru really slow after a while so suspending over a drain helps a lot.

It's not going to stop the damage but will help minimize it.