Yes, there are too many styles! I find many of them have distortion, sour notes and incorrect instrument assignments. I have tried messing with them , in the past but it seems that there are so many good ones, why waste time trying to upright a deraile style.
I've decided to try to stick to only styles created for Yamaha keyboards with 4 variations. I make up floppies for each stylr type, eg 'Boogie', 'Swing', 'Rock' etc. Then as I'm travelling through a music book, if I find a style that suits a song very well, I rename the style to that song. I also write at the top of the page, in the book, what the name and location of the style is, either internal, user or floppy. Eventually I will create a floppy(s) dedicated to each song book. There can be more than one style that is approprate for a particular song. So as I get out a song book to play from, I merely have to plug in the appropriate style disk and I can travel through the entire book without interuption. Of course I would still audition any new styles and try to fit them in, if they are usable.
Any thoughts?

Brian