This might be better in the Luthier's Corner, but as an action adjustment question, I thought I'd run into more opinions here. Fender P bass with a Modulus BaSSStar neck. Not a perfect fit (necks a touch narrow in the pocket), but a great neck on a great body. The neck has no truss rod, but rather has a certain amount of built in relief. I can't flatten this neck, but the action is quite high in the upper register. The saddles are about as low as I think they should go without buzzing on the 21st fret with finger on the 19th. Should a certain amount of fret buzz be expected? Would shimming the neck be the way to go? And would I be shimming to raise or lower the headstock? What are good shimming materials? Also, the wraps on the strings cleared the nut on the stock P neck, but with the Modulus neck, a couple of them want to rest about halfway into the nut. Can the wraps be trimmed so as to prevent this? No ready cash to take this to a pro just yet. Thought I'd go it alone for now. I'm comfortable with making any adjustments, but not sure just what I'm facing here. Thanks for any input.