Agreed, let those flowers go for at least 2 weeks. Leaves still look very good so there are plenty more nutrients that could be pulled from them. On trichomes I go 50/50 milky white/brownish tinge. I've read several places this is a nice balance, I haven't grown a clone side by side harvesting at different times to verify that claim scientifically, but I can say it was a nice smoke.

By no means am I a master grower, I offer this only as opinion.
I should add that letting them go tan will come with the downside of decreased potency, but with the potential upside of a smoother smoke.
Beautiful looking plant there! Congrats!
Respectfully,
Enigma