to correct a nitrogen deficiency using organic methods takes a while. the best medicine is prevention. but since you're already past that point....
you could try making a compost tea with manure (lots of N) in it and doing a foliar feeding til the problem rectifies itself. if foliar feeding your plants some poop grosses you out then you can just apply it like you have been, but in my experience, if you want it done fast, do it foliar.
ridiculous ideas i've found on the internet involve diluting your urine in water 1:10. there's N in your pee, but there's also ammonia and last i heard that's not very good for plants.
you can put some coffee grounds in your compost tea too. i heard that helps boost N, but i can't confirm that. i do know that coffee is pretty acidic tho... would probably throw off your ph.
i knew a guy who did nothing bet feed his brazilian haze bat shit and fish emulsion via foliar and that was probably the biggest damned cola i'd ever seen on any plant.
great grow though! lovin the pics.
