A couple things before you start buying parts. First, the HES on the 1150 series is much less prone to failure than on the 1100 bikes. If you had an 1100 I would definitely be concerned about the HES. On the 1150, not so much.
Second, I don't think the HES signals control the injectors. They control spark. Actually they probably have some input to injector signal, but I'd be a little surprised if the HES would cause the injectors to fire randomly, or at all.