Flowering yellow tips and burnt tips near bud

In total 2kW of HPS. Rockwool crutons. Fed twice a day at 16ml bloom GH and 4ml Micro GH per 3.4l. Ph 5.6-5.8. Can't understand what's causing this, immobile nute burn? Lights? They're about 10 weeks into flower.

Bump

I'll start with low P - Ca - Mg from too low a pH (reduced nutrient availability)!!!!

pH to 5.8 and let it rise to 6.2 before adjusting back down......Your plant will be much happier in bloom that way!!!!

once I start flower personally I never let my plants get out of 5.8-6.2 pH