help with recurring issue with SOME strains

[AJY]

get your temps up to 80f+, i assume all your light settings, heights are all correct.
about your questions, i was told that some genetics are like that.

Ok so things are ALOT better since racing the temp to 81F. I may be wrong but so far I am having none of the lock-out like issues that were hounding me. Leaves are flat and have that varied deep green colour I like to see. PH at 6.2. Thanks alot PK1 & tobh for getting me to raise temps. I think it might have been my issue ever since going to LEDs.