Hi Mark,
Robots are good for the purpose of improving a stroke or something simple like footwork. It is difficult to then transfer that you matches because you are needing to track a ball in and out and then react to different strokes, spins as you have found out.
You really need to try and hit with someone as much as possible to really improve your ability to win matches.
With the short ball to the forehand, see if you can get the robot to serve the ball into that position. If not again try to get a practice partner whenever you have one to give you a lot of pushes there in a row so that you can get the feel for the stroke. It is mainly a touch factor. The stroke needs to be kept really simple with a very relaxed hand and very little movement of the racket. It is a matter of getting the racket angle right and then allowing the ball to hit the bat and rebound.
Sorry I can't help much more but finding a training partner is the best solution.
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