Respec Florentine, stack balance & balance regen, ctrl-click Elegant Loop, engage Active Block when you have around 80 init, tap Rending Strike every so often. Use gambit to shed aggro if you're getting too much. I think I've died less than 5 times since level 5 in outdoor avcom. For ship boarding, I'll die maybe one time for every 30 waves.
Although, I'm playing with Fencing on the test server, and it has it's high points too.
Dirty Fighting can be tricky if you have 3+ opponent NPCs. You don't have the balance regen to save you in a longer fight. So you should focus on stuns and disables, to take some out of the fight. Also, you can't balance duel, so you need to be able to hit through full balance, so stack +offense to be able to.
Oh, and if you're boarding, "Hold the Line" crew command will give you +10 balance for you and your crew. I have around 130 with that running.