IMO this was one of Sage's best videos. Here are my observations based on my long ago competitions in marathons, 50k's and 50 milers.
Fat is harmful in races, doesn't combine well with sugar, and upsets the digestion.
Too much sugar, too fast, can be upsetting to the digestion, and cause depletion of energy. Drink concentrations should be 50/50 of water, or much higher then that. I could usually tell when the drink were too strong and would add more water to the, so try to be perceptive of that. Drinking one coke, plus two or three waters is much better than one coke.
Complex carbohydrates are good, especially healthy ones. A mix of different kinds of carbs is good.
You already have a coach. Your wife. The key is working as a team and taking her input more seriously.
Focus. If you're aiming for UTMB, then I think it's a mistake to train for the marathon trials, and the longer the races in between, the better. If aiming for UTMB, then shorter races should only be for training, not racing. It would be good to focus on longer races between now and next year.
If you're not good at downhills, which is surprising with your talent, then you need to practice them regularly! I always did this before marathon+ races, and they helped me a lot in many different ways, including my speed. I could fly down the downhills with very little effort (including a 2:06 measured half at the end of a long training session), and head right back up at the end of them. Dave Scott used to run downhill 10 milers in training. You can get much better at these very quickly with focused practice.
Thank you for giving back to all runners in the many ways that you do.