I know exactly what you are going through mate!!
Been suffering that all my life when doing long distances on motorcycles. I have tried everything, and am till this day to find a solution. The CrossRunner is by far the most comfortable bike I have ever had, but if there was any way of making the seat more comfortable I would do it. I can easily manage 400-500kms on the saddle in a day, but after that the pain will strike quickly!
For example, by recent tour to QLD, the first few days was horrid! Had to endure a lot of pain to get to the Gold Coast. However after day 3/4 I could sit through the pain on the long rides, which was either due to my butt been in so much pain that my brain turned off all the nerves

or my butt simply got use to the seat.
I also don't get the same results on every ride which adds to the problem. Few months back I managed 700kms in one day, and when I got home I felt awesome! On other days, 300-400kms, and I just want to get off the bike.
For what it's worth, compression pants (with no underwear) is my secret these days, and if I know it is going to be an extra long day, then I will add the Moto-Skiveez shorts to the mix. I also stand up on the bike when we get into the small towns just to give it a bit of relief.
FYI: I have tried and own an AirHawk, sheep skin cover, and Moto-Skiveez (both Sport and Adventure models). On my CBR500R i got a custom seat done by a guy called Mick in Goulburn. Worked well for a month, then back to square one.
I wish you best of luck finding something that resolves this, cause I haven't
