You're a little late for cloning, but just take some now from the bottom. I can't make heads or tails of your tds reading. Just switch to EC. Looking at your plant though I wouldn't worry about it, they look good.

You need to start pruning now. Take off all of the flowers up to top 12" or so. Also take off the associated fan leaf. I know that stresses you out, but don't worry, it's what the plant needs. After you get comfortable with that in a future grow you will pick your four favorite branches and completely prune the others leaving just 4 colas.

50% amber trichs is way too late. Or did you mean pistils? Look for 50% cloudy trichs than start to flush.