rvrotr

Hi guys! I'm new to this forum, and my reason for joining is simple. I've run into quite the (frustrating) conundrum while setting up for a fret level...I made my own notched straightedge, and attempted to use it to straighten the fretboard using the double action truss rod (trying on both my acoustic and electric, both of which need levelling). But no matter how much I adjusted it, the notched straight edge NEVER lied flat on the wood across the fretboard (ie always rocks up and down). I even sanded the notched straightedges surface against a known precision straight edge, and still had the same problem. My theory is that the fretboards have slight bumps past the 14th fret (where the neck meets the body). If this is the case, I think I would need to use radius blocks to reshape the fretboard. Has this happened to anyone? Can you provide any insight to this wannabe luthier? Many many thanks in advance!! Ty