Depends on what your after. If you want a weed with more of a couch lock stone then letr it go a week longer if you would rather a more clear headed energetic stone then chop her soon. To choice is compleatly yours as the plant is yours personally I will not harvest until i see atleast a splash of amber but i do try get it as close to cloudy as possible :) when flowers ripen I like to bring the nose into play give her a sniff does she smell potent enough to be a nice bud ? you know its not all about trikes its all about what you want to get from growing :) Though plants tend to put on the most weight from 7 week onwards on the majority of photo strains anyway breeders times are very brief and if your not growing in some kind of hydroponic system you will do well to finish plants in less than 10 weeks including proper flush of course :) Though you do get a much nicer and heavier plant :)