I agree with trying an Airhawk (probably the Airhawk R) or an Alaska Leather Sheepkin in the short run. These are good to have on a long run with any seat...just for some variety.
I also have absolutely no natural butt. My experience with seats is mostly with bikes, which are somewhat different because the shape has to allow you to put your foot down. But you asked for our experiences, so here goes...
Corbin - the most miserable bricks I have ever owned (I have had 3). Never found one I liked in the least, even after thousands of miles of break-in. The Lamonster cut, which is dished in the middle actually hurt me when I sat on Lamont's RT. My butt prefers the humpback, horse saddle shape.
Russell Day-Long - Absolutely the best I have ever owned. It was even comfortable from day one. Made to my specs, my measurements, and my photo seated on the bike.
Stock RT - I am very comfortable on this seat. Best OEM seat I ever owned. That makes me an oddity.
BRP Comfort Seat (RS) - Too flat for my comfort. Not sure how the RT version compares.
Ultimate - I only sat on a couple for a few minutes each. They had potential. A good long ride would tell the story. Available in a long version.
Rick Mayer - Real good seat. He understands orthopedic needs, as a former medical professional. Not sure if he can do a Spyder seat.
Sargeant - Not a bad seat, but was too wide in the front on a bike, for me. Not sure they would do a Spyder.
Motorcycle Dave - (Valley Custom Upholstery) Site sponsor. Does custom recovering jobs. I have not tried one, but they sound like a cost effective alternative.