Aiming should not take more time. There should be no conscious movement into the center area. Just draw back and get your sight picture, that is the first half of the shot. Your aim should be done in under one second after hitting anchor. If it is not, you are thinking about aiming harder, but that does not make aiming better. We cannot physically aim better than we can mentally aim.
Get the aim done, give it to the subconscious, ie. just watch the sight picture to keep it centered, then concentrate on shot activation.