So i have a Warmoth neck on my bass and we tune to Low C. I get lots of fret buzz this way. I took it to a local guy who checked my setup (which is fine) I asked why my 83 precision doesnt get buzzing in this tuning and he explained that there's 20+ years of wear on those frets. So my question is how well leveled are Warmoths out of the shop? I'd like to attempt some finer leveling myself and am wondering if anyone has tips, methods, suggestions I could follow. How much can I expect to take off with a few strokes of the file, etc??