Week 5 flowering not so perfect

Hi everyone I have 3 White widow photoperiod fem growing by anaconda seeds in soil. They are 5 weeks and 4 days in too flowering and two of them are doing really well they have nice fattening buds allot of crystals and look healthy. But one of them have really thin buds and don't seem as good as the other two some of the leaf tips are burnt and cupping up. I have been feeding them flora three part micro,grow and bloom along with cal mag and buddy booster from vita link the EC is between 1.6 and 2.0 the pH is between 6.47 and 6.5 I checked the run off pH and it is correct. The led lights I am using are 12 inches away from the top of the canopy. The temp is between 22.5c to 26.5c I don't think it has root rot as the roots are not soggy or smelly and as for the few burnt leaf tips and cupping leafs I can't work out if it's a mild nutrient burn and not to worry about or if it's a bad nutrient burn and needs to be flushed or if it's a nutrient lock out or if Its nothing to worry about at all. Please help and let me know what you guys think here are some photos to look at
 

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