My eyesight is too crappy to really get a good vibe on the trichs. I usually wait until the fans start dying then cut off a medium sized bud - not the king bud, but one that is mature enough to inspect. If I spot a few amber, I figure there's probably a lot more and chop.
Generally it turns out to almost always be a bit too early, but when you're out of meds it becomes increasingly difficult to say "ok, one more week" for the 6th time. And I find myself in that spot every time. Limited to two plants, and that I smoke like a British factory, it's rare that my last harvest survives until the next.
If you think you got enough amber, give em a whack. From what I could see, they still could ripen on the vine a bit more. I am no authority, mind you.
grow hope the dry, cure goes well.. 
