He would comfrotably win against either, Dooku or Vader in Force only combat. He would also stomp Maul in single Force fight. But it's always much harder, to keep the pressure against a few enemies at once. Especially, it they are en enemies, of Dooku's and Vader's caliber. And Maul is pretty solid in TK as well. Dooku was able to defelct lightning of his own caliber without much difficulty. And his lightning was much of a factor, when he aided Sidious his fight with Talzin. Vader is TK beast, and Maul with all of his stamina will be hard to eliminate.