Finally able to increase the light schedule to 20/4! The plant is super tiny due to 3 weeks of 12/12.
Started feeding 1/2 strength BioBizz recommended schedule.
Tips starting to yellow up despite being fed and soil being somewhat dry. Hmm. Let's see where this goes.
Edit: Turns out it was heat stress in early stages -- I didn't account for the moisture being sucked out of the air by the diatomaceous earth I have strewn out to combat fungus gnats. I saturated the DE with water (It sizzled! Crazy stuff) to raise the RH% to ~70, and fungus gnats still die on the DE. Success!
@raptor65, Thanks man! Not my first time growing Cherry Bomb. First time around it came out great and I loved the sedative smoke, but this time.... yeeaah... I'm fairly certain there's a virus or pest involved. Growth is stunted, leaves are curled and mottled. It looks a bit like TMV to be honest :/ I'm thinking about throwing it out to sanitize grow tent and start anew.