Thanks @MedeaFleecestealer
Lots of good stuff in the links you shared!; gives me ideas for what to try next.
I'm currently at L9 Brigand, and a first-time Rogue so am early in to figuring out that mastery. The only mastery I know well is Hunter, so the Sage and Avenger builds sound interesting, and I'll probably try one of those next.
As for Find Cover, I've never even tried it because I assumed it would make my toon move to avoid, when I actually want to be attacking; something that, unfortunately, sometimes happens anyway. I'd rather stand there and get hit a few times than have the AI make me run away and get hit even more.
BTW, I'm a big fan of titancalc.com and use it regularly.
Thanks again