Question about gravity

I am about 2-3 weeks away from harvest and just performed a water change. This time around I added Humbolt County Gravity so that the nugs get all big and ripe. I reduced my nutes from 1200-1400ppm to 350ppm and then added about 40ml of gravity to my rez. there is 15gl of water with ph around 5.6. My question is does the amount of gravity I added along with the reduction in nutes sound right? If you guys need some pics let me know\\


Thanks

anyone? dont wanna kill my girls so close to finish