To conclude:
While Vader can be worthwhile in a game (friendly or competitive, it does not matter) the other available TIE Advanced pilots are not. So the TIE Advanced is not completely broken, it is overpriced by 2 (to 3) points. Even Vader is overpriced.
BUT its fair that the Imperial answer to the X-Wing shares the same base costs as the X-Wing. So there has to be a way to add more value to the Advanced, to be an even match for the X-Wing. Adding 1 firepover would outmatch the X-Wing - so this is not the way we are looking for. Adding a 2 point value (for 0 costs) for more reliability of its firepower 2 probably is the best way to impove the entire fighter line to match the X-Wing, without overpowering it (nor Vader).