Like I said, and read it again.... "top 3.5 level serve, nowhere working at the top of 4.0.
You are a 4.0, and your serve is not near the best.
EXACTLY as I said.
Why isn't your serve that good?
Very little legs, resulting in limited speed and power. Very little twist and ab crunch, same result. Very little trunk twist, same result.
Your serve works at 4.0, but not WINNING 4.0.
It might improve, but not with your attitude.