That's WAY TO MUCH FERTILIZER EEEEEKKKKKSSSS!!!!! Gonna kill it.
DIrections say only 2-3 TEASPOONS MAX..... Not TBLSP.
How hot is it?? Loks like the leaves are tacoing from heat stress, or the FAN could also be causing this by blowing dry air on it. Whats Humidity??? Get fan off of it.
Also use tap water that's been sitting out 24 hours. Distilled/RO water will strip minerals, and isn't necessary.
Whats your medium?
If the roots are filling up to pot at this point I would up pot to whichever you decide. A lot depends on you. As has been stated, if youre gonna use that light, better up pot, and flip the lights in a few more inches, or it will outgrow the light capability.
Also if it is Purple Haze, it is very much Sativa, and they require higher light output to be happiest vs indica dominant, and it will stretch a lot after flip.
If possible??
Id get a bigger light.
Id use at least 50w Sq/ft, regardless of light source.
Scientists measure the Sun by several different ways, and W/Sq/ft is 1 of them. Sun is 10,000+ watts Sq/M
Up Pot
Read Up on Feeding Schedules with those products.
Get the fan off the light. I do like to have fans going, and I want to see slight movement from my plants This makes the branches stronger. I also keep the fans on, when lights are out. Exhuse is also a good thing. Anyhting to get air exchange.
Do all you can to get fresh air exchange.
KISS.
Keep It Simple.
Its not rocket science, and if you adhere to several basic facts, you will succeed. Veer off any, and you risk failure. The further you go from the basics, the more chance to fail.
Good Genetics
Strong Light. I like 1000w Hortilux HPS. Or 1000w Gavita I also veg with these, and seedlings only see 1000w from day 1.
Great Air Exchange
large enough pot to support a pretty good root system.
Light Grow Medium.. I like Promix BX for basic. Living Soil is good for long term organic.
Learning how to Feed/Water
Clean room.9
I also recommend a cheap Lowes Moisture Meter.
Never let the needle get to Low Moist Line on the dial. Always just a slight bit up from Dry/Moist Line. NEVER to Dry. Low Moist. Cant stress this enough.
If a pot goes dry the fertilizer concentrates. The when you water, it releases the concentrated salts, burining your plants. Add you may also feed at this time, compounding the overfert/concentration of salts even more
Fabric Pots are good.
After Up Potting, I would strt Bending that plant so it grows Horizontally, and then I would train all side branching to grow horizontally. You will at first have to physically manipulate the secondaries, but the new growth wont have too be messed with. Instead of growing a Tall plant, grow it like a grape vine. It will turn into a hedge. Just keep the top bent over. It will grow itself. I don't like Topping. I like horizontal bending, and keep my growing tip. Topping can be good, but IMHO it slows turn around time, because the plant has to recover. If recovery is taken into account. Topping works. But for me speed, and turn around re important, and topping IMHO requires more veg time for my purposes.
I like Promix BX for grow Medium.