More saddle time is the only thing that will help.
One of my bikes has a stock seat that is unable to do 10 miles comfortably - according to the Internet. I have no issues spending all day riding the thing with the stock seat because I took the time to get used to it.
Some seat just do not work well with some people's anatomy..Period. I could not do more than 100 miles on my stock seat and it would hurt... I wasn't about to try to break in that piece of ****. I can do over 500 on a Mustang wide tour or Sundowner.