Does my plant look like it has wind burn and a pho...

Hi @FrostyBuds! Not sure about the wind-burn, it's hard to say with the 2 pictures you provided, but about the brown spots onto your leaves yes they are showing signs of a Phosphorous deficiency OR pH fluctuations. Since you've been giving only 1.3ml/L of nutrients, I disagree with the other answers : yes you're having a nutrients lockout, but no it's not from too much nutrients. It's - in my opinion - because of overwatering. Your pots look verrrry wet and your substrate's color make me think you drowned your roots. As an emergency move, I'd try to let the soil dry for a few days : your soil needs to be on a dry/wet cycle otherwise roots won't spread and search for water. Compact soil or over-watering can lead to a Phosphorus deficiency, even when all other parameters are perfect. Once the soil is almost 100% dry, transplant in a bigger container with fresh soil and give it a good meal with the correct pH range (~6.2). The bigger pot will help roots to spread and will prevent from root-bound & under-watering. Also, you may want to re-calibrate your pH-meter, to ensure your issue is not coming from wrong pH and/or pH fluctuations. Then see how it goes. Hope this helps, I'll be around, keep us up-to-date so we can help you adjusting your parameters, and happy growing!

Your ppm is very high for week 2. Can't tell what the colours are that would make identification much easier as you have taken picture under LED lights. As you're still in small pots, I would transplant into a larger pot and just feed pd'd 6.2 water for a week with a very very low ppm (~250ppm) of grow feed after that first week in the new pot. The larger pot will dilute the too-much-nutes and new roots will be able to stretch rather than be surrounded by too-high ppm media. Water the outside of the new pot so the roots have to stretch and grow to get to the water. In the second photo, they look ok, so I don't think the nute burn has done too much damage thus far - you've caught it early.