I have a 1979 Stingray that I had refretted recently. When the job was completed, I was informed that there was no more adjustment in the truss as it had 'bottomed out'. The relief in the neck, although not bad, is not where I would like it. So to counter this issue, I was going to put on an extra light set of strings. Sound like a yea or nay? My other though was to install a spacer on the truss behind the nut to give it a little more purchase since I can only assume the wood has compressed over the years, hence no more adjustment. I believe I saw this in a Dan Erlewine article, but I don't remember exactly what he used. Any suggestions?