I have the same problem. I've only been back in the saddle for a couple of weeks
but after an 8 mile ride my rear end is not happy.
Not sore as in rubbed or chaffed but the bone at the top of my buttocks aches.
Will this pass as I get accustomed to riding or am I putting up with pain
unnecessarily?
After much reading I also was considering a Brooks Saddle or some padded shorts.
Struggling to find shorts in my size though.