I had a real good play of this bass over the Friday evening and the weekend making small adjustments to lower the action in stages. The bridge is down as low as it will go and now the bass seems to be fine, a much lower action and, interesting that the strings feel less tight. Will try again tonight after making changes yesterday and see how the land lies. I haven't measured anything, just opened the filter so that I can hear better any buzz and adjusted things till it felt right. I did have a refret when the bass was refurbed so if the dead spots are still evident, I may have to get the frets dressed.