Trying to play ay the same level in matches that you do in training is dangerous. Unless in training your coach is trying to make you play worse, it is not like a match at all. In a match the opponent is trying to win too, all he needs to find is one thing you do not like and you cannot avoid, and if it is his service you have a long night ahead of you.
Many players play fearfully in matches, they don't realize that missing is as much about gathering information as it is about winning the point. When I serve backspin and get a push, if I miss the third ball, I need to diagnose what I did to miss and whether I needed to add more or less spin or loop more or less forward. The score and how well you are playing should not concern you so much because it never changes the goal from your perspective. You need to just focus on adapting to the opponent and deploying your weapons to frustrate the opponent. Sometimes you serve they push, you push to the side they are not standing at to challenge them and see whether they do well iif forced to move a little, it isn't always about who plays the ball better. Looking good in practice doesnt matter unless the practice ball is designed to frustrate you.
The most important service combination is backspin and no spin, it is the most fundamental and simple deception technique, and it is the one that consistently scores at every level if you have a good third ball. You can even score with just no spin if it looks like backspin as long as the opponent doesn't adjust. Service is the most creative part of the sport. Reverse pendulum is the most difficult technical service, Waldner never developed a good one, it is not worth discussing to be honest.
I could be wrong but you need to talk to someone who focuses on fighting and match strategy, not on your results. Fighting is s mentality, it has very little to do with how well you feel, you just have to accept who you are and figure out how to keep your problem solving mindset throughout the match. Letting misses upset you or the score annoy you doesn't let you focus on what you need to do to win.
All that said, the Video safe footage thread is there if you want technical advice. In the end though, if you won a game off those players you are a good player player, the real question is whether you are justified in letting the result make you feel that something is wrong with your service. Service can always be better, but the service that works against an opponent can be anything. Even my current coach is teaching me to Steve fast long with forehand and then block the return (relying on the fact that the stroke will put tha teruener out of position).
