Get on top of training it early on. I use a tomato cage for my KM, and train the branches to grow in a circular pattern around the horizontal wires of the cage. It just continues to stretch for what seems like forever.
I let my KM go to around 100 days before I chop her. There wasn't much pheno variation between the females I got, and the first few runs I chopped her a little early. Be patient, and let those trichs turn cloudy/milky and you will get her full effect. 85'ish days will give you a very racy high, but that extra couple weeks will add a narcotic-like euphoria to the finished product. If you can envision an UP opiate effect, that's about the best way to describe it.
Best of luck!