I think my second serve is better than my first serve. I hit it with more spin and get it in 9 out of 10 times. My first serve is not that fast it's just a bit faster than my second serve. I'm about a 5.0 and can hold relatively comfortably. The issue I have is my coach is trying to get me to hit harder by telling me to hit it like my smash. I have a decent smash but whenever I try I can only get the ball in 1/4 times. I need to hit up not down like the smash right?