+1 for the Specialized Lithia
I was having exactly the same problem. Now I use a combo of the Lithia (130), the Shebeest short with the century stretch chamois, and 'homemade' chamois cream (à la Keith Bontrager). All three go together to literally save my hide, but I think the new saddle made the biggest difference.
I had to take pretty extreme measures because I'd so abruptly increased my saddle time, and couldn't take time off. But the big race is this weekend, and after that I'm looking forward to maybe going on some rides without the 'cream', and maybe with a thinner chamois. Can't wait!
Oh, and +1 for the saddle rental idea!
I'd LOVE that, and would definitely take that option. It would be a great chance to try out some saddles that I can't find around here, and save me the potential hastle of trying to return a 'lightly used' saddle after trying it out.