Drooping leaves, slight nute burn?

My plant had a good start, and went through a rough transplant about halfway through its life, but since then its done really good. It's about six weeks old, grown from bagseed. I don't know if its female yet but I was planning I putting it into flowering this week. At 2 weeks I transplanted to a larger pot and it did not go smoothly to say the least. It took about 10 days to recover with minimal growth so that's why its a bit small for 6 weeks. I started feeding 1/2 strength fox farm grow big every other watering about 20 days ago, which it seemed to love. I gave it a little bit stronger of a mix and it started to get very small yellow spots on random spots on the fan leaves.

I gave it just water today and I'm not going to give it any nutes for the next couple waterings. But my main concern has been pH. I have not had a meter and I'm positive this is whats causing the tips of the leaves to slightly warp. I use distilled water but I realized since I've been adding the nutes the pH must be going down a fair amount. I'm going to buy a ph meter and some ph up&down as soon as possible.

So I had these problems basically already figured out, but today my plants top leaves are extremely droopy. They look awful. I hadn't watered them for 3 days and soil felt almost completely dry. I figured they were under watered since before the last watering it wasn't watered for 5 days. I gave it a liter of water, the bottom leaves perked up but the top leaves seemed to completely drop down and they feel dry ?

Humidity is between 20-60 up and down. Heat at 86 (kind of hot I know) 2 6500k 23w x 4 2700k 13w x 1 5500k 23w

my plant has had a few problems but it just looks really bad today for some reason

yesterday


Today


Nute Burn?

pH problem


bottom leaves started to perk but up idk with the top
drooping leaves wtf

It's not over fert I'd think u r lacking in p k probly lockout due to unknown ph try pool test kit from Walmart least it will give u intake ph n run off ph if unable to ph test water give 50/50 veg flower with folic acid it buffers ph slightly and also nutes to be absorbzoned ph is off to some degree mix n u will see diff in days if not less also h202 is must in any medium extra o2 at root zone outways lose of 1% organic material also this could be coaused by rootbound those pots are small n cant hold the water that plant could need