yeh man i would think either ph or overfert leaning more to the over fert one of the pics up there look just like a ph prob i had with b52 and it had the exact charicteristics that that leave shows pic 3 i think. how far you into flower now mark.the postman.

sorry didnt get to read your last post mark blueberry can be ultra sensative to nutes and salt build up can lead to overfert issues i found hope you get it sorted mate