Stress

Normally the Green Sensations has a strong impact on the fisrt uses. In my opinion you should do a reduction of the amount of Green Sensations used on the first weeks of schedule and you should use some Ascophyllum nodosum solution (kelp solution - the one from Cultivers Amazon is great) and use it for a couple of days. Try as wll to charge a little bit on the irrigation at least a couple of times during the week with some Cal Mag at 1/10 of the total amount. The curling could be as well hidric stress due to heavy irrigation , so try to irrigate at least at 1/3 of the total water that you using daily.

I cannot say whether tips curl up due to inappropriate feeding or heat stress. It looks like upper leaves have more problems than just tips curling up... Just a note: when you start giving Green Sensation, neither Zym or Roots are necessary.

what medium are you growing in? whats the ph?? if you can link the diary or give me some more info cheers mate