I have 100% in backhand and forhand, 0 in topspin and when I hit acceleration shot ball is kinda slow, only around 135 km/h. I dk why and I'm constatly overpowered by other players who hit like 140 - 150km/h all the time. I know how I should hit the ball, I have preview on but its always the same and I dk what to do. Can it be because of ping, lag ? I'm confused but when I have the same stats as other players and they hit 150 and I only 135 its weird and annoying

pls help me if u can thanks !!