I was reading the story of Jesse James and his gang. What in the world does that have to do with racquetball?
Here is what struck me. They decided to find an easy bank to rob and settled on Northfield, Minnesota. As soon as they rode into town they were marked men. Nobody rode horses in that area but they did use buckboards. The men stood out and that alerted the townspeople, who had their cash in the bank, that these hombres were up to no good. The townspeople were tipped off by different behavior.
I am watching racquetball matches and I see an athlete moving along at a pace they are comfortable with and then they hesitate. They only need to hesitate a second and the opponent is tipped off as plain as if the server were riding into town on a horse instead of carriage! Lesson here is keep your pace the same. If you are changing your serve keep the pace exactly the same and that means deciding what serve to hit before you enter the service zone. Changing your mind tips off your opponents.
Oh, and the over-acting thing does not work usually either. The pace is changed so the server can over-act like a ball is going left when it is going right. That is a sure give-away too! That botched bank robbery led to the demise of poor Jesse (eventually) and his gang. Do not let your serve pace lead to a loss in racquetball!