3rd Week 12/12 OG Kush with problem and 3rd Week Flowering Blueberry

my og kush has had this problem from about the end of the first week. i've sprayed with cal mag about five or six times. not sure what else to do. i think i overwater'd a little the first week but i bounced back from that. i'm still getting leaf curling. i'm getting good growth rate now but not as good as it could be. anyone have any pro opinions. I threw in one or two pics of my blueberry.
 

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I'm still getting the same problem in the bigger leaves. anyone have any ideas?
 

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