Great pictures chop her down :D I don't think flushing increases THC. The trichromes grow from the bottom (a cell that excretes phytochemicals), this is a fairly slow process and the head of the trichrome will not grow much more than what you have, only mature/degrade. The stage after amber trichrome is the trichrome falling over/breaking. Leaving the buds longer will result in more CBN and less THC