I think you should take my comments with a grain of salt, because you are probably much greater player than me. However, I will say that when we make adjustments like you did, we tend to over adjust. I think this is just your normal learning cycle, after immersing yourself in a new skill, it is normal and probably beneficial to go a bit overboard as you did. I got the impression that you went from one extreme to the other, and now you are seeking your happy medium.
If that is the case, you know what to do.
winter makes it hard to practice serving. off again on again til spring....sigh