Tick pre-res needs to be for the skeletal mesh component to the motion controller, that or you run your IK tick far later like Post_Physics tick grouping.
As for the slight delay on the set pivot override, in that case the controller needs to tick AFTER the skeletal mesh as it won’t be in the correct spot otherwise, and/or you are using a physics grip which can have some velocity drag on it unless the settings are finely tuned on it.