First of all: why QS2?
Without running shot it barely worth to take the class. I know Caltrops and Pavise are nice and all, but they can’t add enough to your build on their on.
CA + FA1 is fine to go, together with SA2. But you should really consider making QS3 since there are enough CDs for you to run around or you do not take QS at all in a new SAFA build. That’s my opinion.
A FAQS should have both ranks at 3 and there are some nice options you could choose in between. (e.g. Scout for PvP or Rogue for Sneak hit in PvE)
Do I think you should keep the SAFA route?
Yes, if you enjoy partying.
No, if you enjoy solo more.