I'm curious here, why use the same approach for a 200? I admit I'm at the front of the bunch on 100-200 distance, with a 200 being 8 hours-ish riding time for me. I would definitely not be too tired to drive, given 1-2 hours to eat, drink, chat after the event.
A 300 would be a step up, and a 400 definitely requiring night riding and in my mind definitely requiring planned rest.