My carbon fiber frame doesn't give me digestive problems very often. Maybe skin to carbon contact via the handlebars is making you sick? On a serious note, fiber does upset my stomach sometimes while riding, so I usually limit my intake of them and eat more of some homemade bars which are lower in fiber but still high in energy.

+1 on the dried fruit. I think I am going to get a home food dehydrator because it is cheaper than store bought. There are so many different kinds of fruits you can use.