Lets see how this ends

K.I.S.S principle........my favourite. K.I.S.S. answer = start a flush when there are about 95% brown pistils and harvest about 2 weeks later when there are 98-99% brown pistils. This will put your plant in the "10-30% amber trichomes" zone without having to look too closely and is also when your plant will have peak THC levels. Going by your pictures you are right, another 4 weeks or so still to go. Hope this helps, Organoman.