I went by the trichs.... the timelines are just a heads up of what you can expect on average. When I expected for the trichs to start turning amber, they all had growth spurts and spit out some more clear trichs and fresh pistils... Kind of like a second "fattening" stage. Not a bad thing. However, once this happened, I let them go for another week or so and then harvested. As we are all aware, this is a heavy indica stone. I like my highs to be as up and clear as possible.
I would harvest yours over the course of 7-20 days if you are planning one growing this strain more in the future. This way (if you take notes), you can see exactly where in the trichome development stage you like your high to be.