If you have that many miles in it's either adjusted poorly or more likely a poor saddle choice for you.
If you have a good bike shop nearby they have a tool to use to find your sit bone width. This is a good starting point to find the back side of the saddle width you want. Other factors, like your perennial pain may be resolved through a "flatter" saddle, a cutout, and could even be the result of a poor fit elsewhere on the bike.

With that said, I have the Flyer Imperial and so far am very much enjoying it. Love the springs.