2 Weeks into flowering, clawing, leaves curled down and upwards, and yellowing

Hi Guys, i've been reading over here for a long time, been using this forum to troubleshoot my plants. however this time round i've been having clawing issues and leaves are curled down and even some upwards at the newer shoots. It's just been sexed and 2 weeks into flowering, some hairs starting to form everywhere. Then soon after, i noticed all these problems. I thought it was nitrogen toxicity so I lowered the PPM from initial 1100 to 800PPM by adding more ph adjusted water, however the situation did not improve and got even worst with more leaves clawing and turning into an umbrella shape. Lower leaves yellowing and falling off

My grow is as such:
Strain: Amnesia haze
Last PH check: 6.3
Nutrients: 800PPM
Lights: LED Hydrogrow lights about 8-12inches above the plant

Im not sure if it is nitrogen toxicity or something else?

I just did a reservoir change with overnight air-bubbled water and nutrients for blooming at half strength 500PPM.

Could anyone tell me whats going on, whether its a deficiency or toxicity or is it heat issues or humidity issures? And what should measures should i undertake Thank you!!!!!!! here attached are the pictures of my grow

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It looks like it could be nitrogen toxicity (clawing) and potassium deficiency (yellowing with brown spots), maybe an iron def. or something too from that last shot.

What nutrients are you giving it? I would at least remove all N from the feed for about a week if you can. The yellowing and brown spots could be from too much N.

Improper pH. Needs to be lower.
Over watered . check your stones.
Beginning stages of cal/mag def. Use epsome salt.

Thanks a lot guys i just threw in another bubbler and will pick up some epsom salts tmrw! Will update again in a weeks time. Hope things will go well

N toxicity can lead to other nutes locking out as well. you know what it is. chill on the nutes for awhile it can possibly be saved bc its not too bad.

in add to what everyone has said it may be temps, is it warm? night/day temps?

temps are admittedly slightly warm as its blazing hot summer here i've no room thermometer, but plant has been regularly receiving good fresh air and circulation and doing ok with the heat so far. I've adjusted ph to 5.7 over the last 2 days and added p,k nutes to it. i suspect potassium deficiency as i noticed certain leaves have that dark patch and curled upwards. hope things will go smooth in the week to come! Will update shortly should there be any changes once again thanks guys. You guys have been most encouraging and helpful.

That's a Sativa. Sativa's are FUSSY feeders !!!!! You have been way over feeding her.
You might go right on down to 1/4 strength and up from there IF need be (KEEP the Ca/Mg at FULL strength).
The yellowing says very loudly that you use a high P bloom food ! (P tox)
You have to much N and P. All the problems of the yellowing leaves revolve around the high P.
Drop the high P bloom nutes and return to veg nutes.
"BUT, I must have high P&K in bloom, with less N". To a point.....if you MUST add a high P&K anything,,,,,use a moderate P&K booster (0 - 5 - 7) at 6 weeks at half strength, ONCE. Do it again at 8 weeks (3/4 strength), ONCE and lastly at 10 weeks for long running Sativa's (12 weeks) ONCE at full strength.

Agree with Dr. Who - to fix - flush your plant for one week and then readjust your nutrients, your plant will come out of it. Remember each grow is always better than the last' looks like your are using LED's so heat is really not an issue. watch your watering also

Guys thanks a lot for the help, i am now 1 week after flushing, new leaves looks better, clawing still present on older leaves but situation seems to be turning around. I have one query thou, as my plant is already week 4 into flowering and buds are not showing, althou sex is shown now. I suspected a light leak problem for the first 3 weeks and took care of it recently. Should there be any steps taken to jump start its bud forming phase? I am having height issues now as its almost reaching the ceiling height where the light is. i dont have any more space at this time now. Any suggestions as to what I can do? Cheers buddies. Thanks for the help given.