Great advice from everyone! Now I've got a plan.

1) Try out the new saddle I saw at a Trek booth earlier this year (the sales rep had the "measuring thing" so I know what size I need). She thought the "Bontrager Inform RL WSD" would be good for me. If it's no good, keep trying.

2) After the new saddle is on, get refitted at my LBS. When I had the first fitting I'd never even been on a road bike before, so I'll bet some follow up tweaks are needed.

Thank you!