I never was a huge fan of destroying Jaesa's life and personality just for the sake of being able to romance her.
Well don't do it for just that reason
I know with my Sith Warrior, wanting to play her differently than most of my other characters (which would mean usually ending up very light sided, but not 100%...LS2-4 depending on the character)...she came off as a bit...bi-polar.
Affection would go up and down with Vette and Jaesa, though interresting enough, usually always down with Qunn. No desire to use the Talz, and never got around to using Pierce in missions.