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Water/feed is 23 degrees; lighting is 600w HPS; approx 60 cm above canopy. Until recently it was higher than that - I'd raised it a while back to try and reduce the potential for heat/burn problems. But given that I seemed to have a Nitrogen toxicity issue I lowered it as I'd read that the plants can't process the N as readily with insufficient light.     Oh yes, I'm a firm believer in that! Next time its Growers Ark for me, see if that changes things.     I'll struggle to get a reliable EC but pH should be attainable.   Thanks for your input, it is much appreciated.

What temperature is your feed?what light are they under how high is it? ime once you see a calcium problem it's too late,your forever chasing your tail. calcium is a chelator and assists lots of processes in the plant,it is easily washed out and hot dry atmospheres and highly transpiring plants soon lack calcium.   what i have done in the past cut off all the necrotic parts of the leaves,they aint doing you or the plant any good lower your temps,improve air flow Check the ec  & ph of your run off  next time you water with bloom feed. You'll still get a smoke out of them.

Howdy doodles dude Better off being a bit heavier handed with the training.  Avoid trimming autos if you can. Upload some pics let us appraise the situation.   

if only it were that simple