I have a fretless J I put together a while back. I worked on it over the weekend to lower the action. I was just eyeballing things - no proper tools to measure with. But, the neck relief was minimal - it looks just like a couple of my other basses that have nice low action. But, when I lower the saddles to as low as I can and still play it, the action isn't as low as I thought it should be able to take. Any lower and when I fret just about anywhere it seems to buzz all around frets 18 - 20. And I even noticed some signs of wear on the board around the neck heel. So, my question is, is this an indication that I need to plane/level the board? Is this just how it is with fretless? The action is just about as low as my best fretted basses, so maybe I'm expecting too much? Should I shim the neck to change the angle just a little bit (raising the headstock end slightly)? Should I take some relief out to get it even more straight? The board is ebony with lines. It's an Allparts neck. Is it safe to do some sanding on the whole thing? In particular to get rid of the signs of wear down around the heel end of the board? Thanks for any guidance!