Sounds like you are well-prepared for the 1/2 coming up - in fact, it actually sounds like you're ready for a full in September if you keep up the kind of mileage you've been doing.
When doing the higher mileage, I eat lots of good carbs - fruits, vegetables, whole wheat cereals & bread and am able to keep my weight steady. I make sure to include enough salt in my diet too. A few marathons ago, I didn't and it affected my calf muscles the later part of the marathon. For long runs (12+ miles), I always bring gels and take one every 1/2 hour. It keeps the blood sugar up and prevents bonking for me. In Boston, this year - it was so hot, I needed to include a few more gels, 2 iboprofen, and some electrolyte stamina tablets - in addition to 2 cups of water per station. The weather has a big bearing on how you feel during the long runs. Too hot and humid - means more water breaks and more gels and much slower pace. You can't worry about your pace in the heat because by the time you do your full, you'll probably have cooler weather and your legs will be ready. I hear you about the "race horse" feeling - for me it's a readiness in the legs and feeling of strength - mentally as well as physical. If you plan on wearing the Garmin in the race - it should keep you on pace for the first mile(s). In the past, I've worn the pace wrist band from the Running Times website and found it extremely helpful. It helps keep me focused on my pace and not on any negativity (like why am I doing this?) I'm expecting the Garmin to take the place of the wrist band. BTW - Used the Garmin this morning and it works well. They transferred the history data over - but I still have to figure out how to merge the data from today. I may have to update the firmware to the newest version afterall.
One final thought - with the mileage you're doing, you shouldn't have to worry about weight gain in any case.
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