Man o man…you’re in the funnest stages of growth!! The stacking must be visible day by day. Your plants have looked great from start to finish… no doubt because your doing this 
Looking at your pics, you seem to bang on. Trichs are frosting up nicely, pistils turning red…the end is near.
Becauae this stage is so important, I don’t want to give any advice…I don’t want to be held responsible for buggering up a beautiful grow…lol. This is a very personal process. Many people have their own “end of life ritual” for their plants…lol.
Some late night/early morning reading for ya. There’s all types of good info peppered in the thread below related to NPK ratios and stages of growth.