I agree with turning every pitch into off-speed. The key IMO to the sit.... is to not give up the coil in the rear hip so you can land balanced. The only way I am able to do this is to maintain ER pressure in the rear foot.
If you want to "sit" on a pitch you don't do it with the hands leading. The hands are last to move in that case. The hip leads. They can "sit" as long as the hands aren't ahead of the hip.
What keeps the hips from rotating as you wait?
What keeps the hips from rotating as you wait?