your actual tailbone hurts? as in the coccyx at the end of your spine?
if your saddle fits you correctly your tail bone should never contact your
saddle, only your sitting bones, which are underneath your buttocks, one on
each side (put your hands under your butt you should feel those bones coming through ... i'm boney, maybe that's not true for everyone)

so if your tailbone is hurting something is really wrong.
and on a long ride i notice that the point of my saddle is not always DEAD CENTER between my thighs.