It was Sidious's pure hatred for the Jedi and his excitement for the fight of a life time spent waiting for that Mace was able to feed off of. Dooku's hatred is no where near as strong as Sidious. In fact when on Vjun he was considering going back to the Jedi. Also Dooku's style is very collected and calm. Precise (contrast to Vaapad's wild strikes and wide openings). Not the very thing Mace would get a good amp with.