Hey Munki,
beautiful plants. I just have some ideas as far as efficiency and your PM problem. If you ran just plain water (ideally RO) in your ebb n flow and just used Osmocote+ throughout and Dynamite 13-13-13 top fed for bloom in the medium, it would eliminate one possible source of...
1) Does LST increase yield? It can depending on what your light source and setup is. its really a situationally dependent action because root mass and number of healthy leaves determines bud size
2) Can you tell the sex of a seed to any degree of certainty? nope
3) Luxury nutrition - true...
disagreed. its just that indoor growing conditions do not allow the amount of red/blue saturation to allow the plant to metabolize it. red lights in the grow room (higher than 570 nm) will not trigger a daylight response.