I have been playing for a long time, and I have some bad technique that have to unlearn. The biggest problem is the serve, I use to serve with a western grip, now switched to continental. The problem is my racket face is at the wrong angle durring the serve, it is too open. I know it is a problem, I know it needs fixing, but I am finding it very difficult to fight against muscle memory. The ghost of the old stroke is still there, and it is difficult to get rid of.