Glue Gelato Auto BARNEYS FARM

so I still seem to be battling this deficiency. i have brown spots on the tops leaves. Thought it was a issue with calcium and magnesium so started feeding cal mag. i wouldn't say they have got a lot worse but I wouldn't say its solved it in the past week either. my ph going in is around 6.3- 6.5. and the run off is 6.3. i think i should never have flushed as all the issues have been since I flushed. I also upgraded the light around the same time. anyone reading this have any ideas? i flushed because the were clawing from to much nitrogen. has my plant gone into lock out and soils become hot again? plant itself seems fine. buds are coming along very nicely and fattening everyday. just the spotting on the leaves is worrying me. anyone advise?