I just kinda' thought that he would have to take large, heavy, segmented steps when holding a big hammer.
Edit: actually I think I'll just replace the run with a short dash.
what
Don't avoid the walkcycle! I think if you made him walk, and then try the run it'd help. From the looks of him I'd expect him to step-plant-step-plant rather slowly. His run would be more horizontal motion than verticle motion with more force behind each step. Think of physics. The more mass, the more force you need to overcome the mass' inertia.
Of course, if you really
want him to take bunny hops, no one is stopping you, it just seems rather strange for such a brawny character with a humongous hammer.