I have a fender jazz bass and I noticed that there was a lot of air under the front of the bridge, not much contact with the body. I checked if the body was flat and it wasnt. Maby overtightened bridge screws?.. Anyway, I took a block and sanded the body flatter to get a better fit. I felt like a bad idea to do this to a 2 year old fender but I wanted a better fit so I did it. Why has this happened? And how critical is it to have a flat surface/full contact when it comes to tone and sustain? I didnt get it as flat as I wanted because i didnt want to sand outside of the bridge and scratch the finish. Any better ideas how to do this better? Or should i just leave it alone?