unsure of this problem, heat stress with low heat?

This plant is an LST'd Exodus cheese. The bottom 2 stems are showing something, I'm not sure. Heat hasn't gotten above 80 at the peak, humidity is around 50%. The rest of the plants and the other 2 plants look great, and all the other branches (about 8 other tallies) are all showing perfect. Haven't had a single problem other than this. Lighting is CFL's, always kept at a very safe distance. Right now they are a good 5 inches off just to make sure but I have no idea why they look like they are bowing and are having heat stress.

this is about week 3 of flowering btw

not heat stress that is nute def just cant think of the right one at the moment lol

yeah that's what I thought, I started foliar feeding on the leaves, figure it was potassium. That's the only thing I can do right now.

I'm thinking more of a nute burn or salt build up
both cause that up ward canoeing with brown
edges and tips!

Looks like potassium def to me, could also be lockout by bad PH

Ph is 6.5, I'm wondering if it was the way I LST'd the plant, if the ties somehow were keeping nutes from flowing to the leaves. It's not nute burn, because it's only on the middle and starting on the top of the bottom 2 stalks, but these 2 were pressed hardest against the ties. I loosened them up and am seeing if that helps. It could be lockout due to roots, it's in a 5 gallon but I think the dirt is a little low. I'm gonna try adding some soil to the bottom, fortunately it's one of the pots where you can jig the bottom off. And the foliar feeding i'm doing on those branches is high potassium because that was my first thought. It's a lot more noticeable in person, the pics aren't capturing.

there's no signature tiny burns on the edges of the leaves, and they are tending to curl before they brown. I upped the potassium dose gonna give it a few days, if it gets worse I'll flush.

I have a plant doing the same thing, what worked for you to fix your problem