So, my serve is not flat and rarely fast. The problem was the upward swing. Saw a video from YT and noticed I had wrong technique for this time. My kick serve or slice kick was good but not on flat. For flat, the lower arm need to slide behind the elbow like when throwing a ball. You can throw above your head or slightly to the side of your head. Check out the Fed lower arm below pic, not from scratching the back.
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