First of all brother, it's probably you, and not the soil.
2) 150w what? Hps, led, sup? More light, especially red/orange, nastier bud.
3) don't fucking burn em. 10 second rule, place hand atop canopy, 10 count, hand's too hot, so is she. Back it off.
4) always calmag
5) 6.5-6.8 ph
6) don't be...