Can't help you on the ppm stuff. I usually go mostly organic, and half strength my fertz until near the second half of flowering, where I increase to full strength. Its also somewhat strain dependent, so watch for nutrient deficiencies. Only reason I'm posting is to say 'looks great so far'. Don't be afraid to keep training during the stretch. You want to keep the canopy even, so you can keep your light close. Every bud you can keep in the high intensity zone will fatten up nicely. I even grow some colas sideways - they do just fine. Check them several times every day, and use string to pull tops away from the light if the highest ones show any heat stress. Move your light up as the canopy height rises. I end up with lots of string crisscrossing, but my goal is to have a solid bud canopy. Trim away any big fan leaves that are shading buds. Buds have priority for direct light. She'll really start sucking the nutes in a few weeks. Watch for deficiencies. Its much easier to recover from a deficiency than over fert. During the stretch she'll want N. Soon, it's gonna be mostly P. As the plant mass in the high intensity zone increases water requirements will increase, so watch your soil moisture level carefully, but don't over fertilize. I find they require more water than nutes, so I feed every other watering (and even less near the end when watering is so frequent). This is where it gets really fun!