I have a G&L L-2500 USA (if that matters). I have been working with a setup guy on this by the way. I get buzzing of the first 3 - 4 fretts of almost all strings unless we raise the action fairly high and put a fair amount of relief in the neck. The at that point the action is stil fairly low at the top of the neck (first few fretss) but sky high the further you go down the neck. If I lower the action much or take the relief out to flatten the neck, I'm back to buzzing on the first few fretts. The neck is fine with no buzzing anywhere but those first few fretts no matter what we do. Just those first few that buzz unless the action is high and/or substantial relief is added. Could the nut be too low? Could the neck be defective only at the top? This is driving me crazy as I like low to medium low action, not sky high. Setup experts help!