Twisted and pale top leaves

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The new lights have a really strong output. congrats on that. How high did you put them up? https://www.amazon.ca/VIPARSPECTRA-Spectrum-Upgraded-Dimmable-Seeding/dp/B085W3LY4Q I think the over feeding might be cause a lot of the issues you are seeing here that was mentioned by @ezzjaybruh

Hi guys, thank you so much for your time to answer my question. To clarify, @Ezzjaybruh , this is the Dark Phoenix feminized, no autoflower. It's in its 5 flowering week. @Kolibri , The pH is right, 5.5-5.7 in hydro. I'll add more magnesium and will check the results, thank you :) @AsNoriu , the Dark Phoenix is in DWC. The root system is super healthy and huge. It's in a 70L reservoir so it has more space than it will ever need. The root right now are about 1/3-1/2 of the whole reservoir! The plant has got a lot of mycorrhizae from the get go up until the flowering, so over 16 weeks in total. That made the root system so huge in the first place. @m0use , I've installed 3 new flowering lights which are 160W more than the previous setup. It ran on a TS3000 (460W) in veg, no it's 3x P2000 (3x200W) which is a significant bump in power output. That's why I've adjusted the height even more and turned down the power by 25% on all 3 lights. I'm curious to see if it was a light stress indeed. These new P2000 lights have newer and better Samsung LEDs so the ppfd is higher than the TS3000. Hopefully you've put me on the right track :) Thank you so much again and have a wonderful day, guys :) XOXO Cremo

If it’s an auto - 1200 PPM (depending on scale) is really too high. If it’s 2.4 EC that’s excessive for an autoflower

Magnesiummangel und Eisen fehlt ebenfalls. Eisen wird sich aber erholen wenn Magnesium gegeben wird und der PH passt. Viel Glück

You in hydro, so check roots first !

Like you been adviced already it could be heat, but ... I personally saw very similar acting plant when my friend was bombarding girl, who just overgrew her pot and started to root rot a bit. Those extra nutes made everything even worse ... If it's not temps, then you would need most simple way - transplanting into bigger pot, I did it even on week 7 of flower, never had any issues. Most simple way. There is flush and root feed alternatives, but you have to know and be sure what you do, saw more fails than success when people start to be doctors, better stay with gardening ;))) All the Best !

You look like you have some definiteness there on the leaves. Typically the pointing upwards and curling leaves are caused by heat stress. I don't know how hot your room is or how close your lights are but they might be causing this. as for the leaves maybe some magnesium or sulphur. cant say for sure with out knowing what your feeding. Good luck