your on the right track by looking at the trichomes, what you want to see is they will expand and start filling up like balloons, the first stage is they start clear, then they turn milky cloudy, the last stage is amber, this is where the plant has reached the max thc for the plant, so you want about 20% amber or more for tis to happen, the cloudy milky trichomes mean the plant can be harvested
and you will get more a head high but if you wait til the trichomes are amber you will have a stronger high perhaps a couch lock.
what i am seeing is you have 3-4 weeks left and based on the strain info and where your at in the grow your right on track. you have come this far so why not wait a few more weeks. your almost to the finish line, happy soon to be harvest, a job well done