How do I best help fatten her buds?

hey there clw , you're doing everything right basically , except the light schedule which is too intense, that's why you're seeing signs of cal mag deficiency even though you're adding cal mag. When you have too much light the plant cant get enough magnesium. Reduce by a few hours and your plant will respond quite quickly . The only other thing you need to do is be real patient, but so far so good ! Hope this helps ! 🚀