I'll say. I don't think that a previously broken tailbone will be much of an issue. Did it heal up? I like my mountain seat pointed just a bit down because it make me lean forward a bit instead of sitting upright. It also puts the pressure onto a part of my butt that is meant to take more pressure. I think it mostly just changes how you are positioned on the bike though.
Ps. I'm a newb to this game; just try adjusting it this way and that way and see what is most comfortable for you. I always take some tools on the trail in case I need one. Especially with a new saddle, I'll be making tiny adjustments all day.