I’m pleased to report some progress.
New saddle is comfortable. The Terry Liberator X saddle works great for long rides. A big difference there. I was sore, but not in pain like last time.
New top tube bag= easy access to food. I bought a Detours Slice bag, which makes it easier for me to use while riding. It opens and closes with a zipper, and I was able to fish out Shot Bloks and a Larabar with one gloved hand. Nice.
Fueling up. I had a good dinner the night before. I took small bites of energy bars and Shot Bloks while on the bike, a quick stop for a sandwich, and followed everything with a Tums chaser. My energy (and mental state) was more or less constant throughout, and I managed to keep the heartburn at bay this time. I stayed well hydrated.
Some things to think about: