Impressive performance - and not unanticipated! Imagine what you'll do with a smooth paddle.
RE: heat eating, I don't feel like eating when hot, so I started bringing more gels - they are easy to tolerate for me (more so than shot blocks or heavier) so I can keep up better (not perfectly yet).
Congrats on your finish. Job well done!
Consider Hammer Endurolytes. Those little things are amazing at keeping your electrolyte levels up. Several other Michigan racers can also attest to how well they work.
Also, I know that everyone is different, so this is personal experience only, but I supplement my race diet with vanilla "Ensure". It's in addition to other fueling foods/snacks. It seems to be key for me in longer races. Each small bottle is shelf stable (no refrigeration required), has around 250 calories with most nutrients you need (protein, carbs, fat) while racing, and most important is that it's meant to be easy on your stomach. I can slam one of those in about 10 seconds, and have never had issues in the heat with it. Whoever said Ensure was only for old people :) Perfect race fuel!
We have endurolytes, just forgot to pack them and definitely under estimated the heat. 70 isnt really that hot, but full exposure for 10 hours adds up.
Anyone that saw the crust on my face after can attest to the fact that I probably lost every bit of salt in my body.
screw the temp, I'm (non Extreme version) 2 per hour even at 30 deg F. It only goes up from there! I've been pre gaming for orienteering regardless of temp. (I'm a high salt sweater and prone to cramping, even at full fitness.)
Seconding Heidi's meal replacement shake - I tried a similar 250-300 calorie meal replacement shake. Went down easy.