A great read Bill and once again well done and a fantastic achievement.
I agree that Drygarn Fawr is a trudge, even if only doing it as a single hill, never mind with 3 long days in your legs. Its remoteness and summit cairn make it one of my favourite hills.
You can of course tell me to mind my own business but I am wondering about your reasoning for not having Caffeine for two to three weeks prior to a big event but then carry Caffeine Gum as part of your food/nutrition?