I never noticed 'more trics' later in growth. They just seem to mature from clear->cloudy-> amber, not produce more of them. The only things I know proven to increase trichs is supplemental UVB (HPS has virtually 0, which is why supplemental MH in flower is good, some uvb from them). Naturally plants closest to the equator have more thc why, because it is a sunscreen and without it they'd be dead. So in short, LEAVING plants longer != more thc, it equals different chemical makeup. It takes over a month for the trics to appear, cloud up and mature to white/amber why would you get more trics just by leaving a plant one week longer, that's not logical to me.