How much longer to harvest? (Pics)

Hey all, I am mid way through the 4th week of flowering. Here are my stats:

Light: 250W HPS
Soil: Foxfarm Ocean Forest
Nutes: Foxfarm (solubles and liquids)

I am currently using the Beastie Bloomz and the buds have really filled out from where they were before.

But as I near the end of the Foxfarm feeding schedule, I wanted to hear any advice about when to harvest. Many people suggest flushing/feeding pure water after the schedule ends until half of the trichomes are decomposed.

I prefer a more sativa/cerebral/less CHD high, so would I want to harvest a little earlier?

Any other suggestions you guys might have judging from the pics would be appreciated! Thanks!!!

Harvest when the trichomes are cloudy for a THC high. Clear trichs mean they have not peaked potency. If they are only in week 4 of flowering (dep on strain) you have roughly 3/4 weeks to go.

It would be strain dependent. What strain are you working with and are you enriching with Co2?