You're leaves are doing what mine did... people told me it was PH problems. I went out and bought a gallon of spring water now for that after flushing the soil out the last time. I thought the plant was just getting older and was taking energy from the leaves that no longer were as dear to its life. So I'm thinking maybe I too should throw some nutes at it...

You've got some good buds going thats for sure... you'll prob have a better turn out than me