Alex, If you are nervous about scratches, buy a cheap screen protector. They work just as well as the expensive ones and it'll give you a piece of mind since your screen gets scratched from dirt and grit even without ever using a stylus. Just make sure not to get a matt finish or extra thick. It will also reduce the noise, but it sounds like you are not keeping the disk parallel to the screen when using the stylus. Think of it as a fountain pen. You just need to rotate it in your hand to g
Sounds like you are more of a 200 series guy. check out the justgosmart stylus page.