Godfather OG - Seriously strong

I do suspect that this plant may have gone into lockout. I did feed it with cal mag to see if the leaves would've shown improvement, likewise with nitrogen deficiency. However, it has not proven successful and some leaves are showing a burn appearance. Therefore I have flush the soil medium out with rain water until a pH was increased from 6.5 to 6.7. I am currently awaiting for a delivery of an EC reader to check ppm etc. Until then I will continue to use water only until signs of recovery are displayed. The bud sites are still growing, just long and thin which proves not much nutrients are being taken up. Time will tell, I am hopeful however.