I am quite skeptical that there is any advantage to religiously low carb hiking. If your energy is flagging, eat a well rounded snack, insofar as possible keeping the glycemic index low (although if you are utterly bagged, then a high GI food is probably going to help). Go by what makes you feel good. It goes back to your rationale for low carbing...is eating gorp on a big hike going to have negative consequences?

And coconut oil is still soundly on the bad fat list, is it not? Slather on your externals, not internals!