I favour the Paula Radcliffe breakfast of porridge, banana and honey but it sounds like you have this covered equally well.Think you're also dead right on the slow run too quick, fast run too slow syndrome so sounds like you're well set.
Thoughts on the race overall? I felt that offering a marathon on top of 1/2M and 10K was probably a step too far and the longer distance had neither the numbers nor really the course to justify it. However I thought the organisers did a good job and tried very hard to put on a good event.
On the second lap I had the highly bizarre experience of following an 'escort' pick up truck driving about 50m in front of me and stopping for me to catch up on the hills! it was very thoughtful but a bit pointless as a) i knew the route having run it 90mins prevously and b) it didn't help anyone else in what was a fairly spread out field by that stage