Nitrogen toxicity without too much nitrogen?

i have a pretty unique situation that I can’t seem to figure out...

I have some plants that are now three weeks into flower that are showing the obvious claw from nitrogen toxicity. This is not my first time growing and I’ve actually had this problem a couple years ago and corrected it without a problem.

Here is everything I’m growing with to make this easier:

Growing in cloud coir 5050 coco/perlite

Mills a&b 6ml per gallon
Mills c4 4ml per gallon
Botanicare cal mag 3 ml per gallon
Bud candy 6 ml per gallon

When everything is mixed in the reservoir it comes out to 700 ish ppm.

The plants are about 3 weeks into flower but I’ve noticed they are on the blue dreams the worse.

Also, right before I put them in flower, I noticed I had a cal mag lockout and started ph’ing everything at 6.5. The cal mag def has been gone for the most part but I’ve started getting the claw pretty bad.

I check my ph and ppm runoff regularly and noticed that everything is in range and even the ppm runoff is lower (around 500) compared to the 700 parts I feed them with.

Thanks in advance

skip the cal/mg and use epsom salts instead would be a place to start. 1g/gal is a good place to start. cal/mg is usually calcium nitrate=more N.

6.5 in Coco is pushing it.