What Ive found helps me against pushers and soft hitters: The Wegner Method. I try the ball all the way to my hands. Keep both hands on the racket as long as possible and let my hands lead me to the ball. Then I watch the ball closely. By doing this, I dont hit early, and my hands lead me to the ball.
With all the time available to you with the ball travelling so slowly, its easy to overthink the shot/footwork/grip. Just play simple tennis and lead with the hands. Dont think.