I recently replaced the neck on my Fender American Jazz bass with a neck from a Deluxe American Jazz Bass. It was a straightforward replacement, and with some minor truss rod tweaking, the neck is straight and the action is fine. Problem is, it just won't intonate -- it's consistently nearly 20 cents flat at the 12th fret. My theory on this is that the bass's original neck was the standard Fender 20-fret, while the replacement has the 22-fret neck. Has going to a slightly longer neck without moving the bridge caused the intonation point to move? If so, is there a fix short of moving the bridge around? I've got tools and am relatively competent, but if it involves anything too heavy, I'm just going to take it somewhere. I just kind of want to satisfy my own curiosity. Any help is much appreciated -- thanks in advance.