You're quite certain that at least 60% of the trichs are still clear? That's a ratio that would concern me a little if I was considering chopping the plant. Too many clear trichs indicate that the THC production hasn't reached its peak, and whilst I'm not too concerned with seeing a bunch of amber, I seldom harvest before at least 50% of the trichs are opaque.
Did you buy that digital microscope? A really close inspection of the trichs, and you'll be able to see whether they're clear and not yet mature (trichs also still standing straight up at this point), or if the trichs are opaque and/or amber and bent over like they're top-heavy (which is optimal).
Stole these pics from the interweb:
Pic 1 is of clear immature trichs, pic 2 shows the stems of the trichs starting to turn opaque, pic 3 is a fully mature trich, amber and bent over. This level of detail is virtually impossible to see with a simple jeweler's loupe, so if you're in any real doubt, maybe go ahead and grab a microscope.
Hope this helps.
Peace