Ok any farming build good or not you will have to adjust to your own liking and I would try your build in a little easier spot to get used to casting and recasting you skills.
The trolls are reasonable easy but you have to watch it if you miss one skill you die it is just how it goes. Been farming for a while now and well trolls aren't worth it I think you bget betetr drops at some of the others like hydra's.
Best results lately I have been having with Rit VwK build to be honest, versatile and pretty forgiving unlike some of the 55 HP builds my 55 monk and necro haven't played for a while now
If you want an easy farm go ettin farming by the way with a bit of luck you get your runes dropped for you
Simple W/Mo build should do the trick. And if you stick with it 30 to 40k in an hour or 2 is still doable (if you get a sup vigor otherwise about 5 to 10k).
But in general once again solo farming is about getting your build taht works for you use the guides as a base to work from but do it inyour own way that you know that works for you.
Most people that have made builds/guides here will have in most cases spend hours of dying to find the best way to get it done, and they will most likely still die on a run they post.