Fan leaves are curling up on edges in flower

Have Ak 48 in dwc system using sensi bloom and bud ignitor super thrive . Just 6 days in flower and leavesare getting crispy on edges and curling up. My Ice strand leaves are getting pale yellow and have little dots on some fan leaves. Using same res for both at 5.8ph and 650ppm.12/12 600watt hps

how are your temps?

ph? ppm? how much space do you have between the netpot and the newt solution?

looks like very slight overfertlization to me, the very tips of the leaves curl, sometimes turn crispy and can stay that way pretty much til they get chopped down.

The pic is kinda small but as you described it sound like it's too hot and under watered.And yellow dots usually mean ph issues or a deficiency.Sometimes plants have to be treated differently,of my 2 biggest plants; 1 cannot take the same nute doses as the other it will get nute burn but they are the same age and at the same stage of growth.

I've done that with a big dose of bloom nutes.. Soil grow here. I try to run the same strains in flower as its easier to track what they like and what they don't. Say Headband eats everything while Blueberry can be a picky bitch.