NEVER piss into your plants. That is just fucking gross. I knew someone who use to do that. Fucking disgusting. I dont care how much you dilute it or whatever. Im not going to smoke your piss fumes.
How much light power are you using... cause those are pretty small... Also no need for nutes, their colors are amazing and perfect.
Re-evaluate the situation.... Check temps, air flow, amount of water in the soil... height of the lights. Its the obviously things that make the difference. I learned quick with my fuck ups.