Plant sex organs are not storage facilities. Any nutrients stored in the leaves is a non issue as long as you don't smoke the leaves. Tests prove that the mineral content of flower is not impacted by whether you flush the plant or not... it simply is not true in a measureable and guaranteed way... it's hard for the true beleivers to let go of this because deep down they feel embarassed to the point of denial, even though everyone makes similar mistakes at various points in their lives.
if you want to harvest now, don't let that stop you. I like to use more than just trichomes as my guide. If you like a more sleepy effect, let those pistils fully die and coil up to little nubs. probably have at least 50% amber by that point. I like an earlier harvest, but each to their own. Don't trust others feelings on it. Experiment with varing ripeness to find what you like. It can feel different to different people.
Think of nyquil.. for most it knocks you out, but for a few they get hyper and wide awak. Weird shit can happen involving slightly different chemistry in one brain to the next...