Started feeding them 3ml/gal mega crop. and started LST
The reflector: this light had an acrylic bottom the bottom stays really cool. With the addition of a cardboard and Mylar reflector I increased PFF/w by 25% and get a more even spread and the grow area stays cool!😁
My biggest problems for taste have always been nutrient excess in soil and fast drying. With those burnt tips and 3-5 days of drying, i wouldn't expect much if it was my grow.
I think you might've flowered too long? Humboldt says they only need 55 days of flower and you had yours in flower for about 70-77 days it appears from the diary. Might explain why it tested so low.