I just had my luthier set up my new Engelhardt bass. He put on an aluminum tailpiece as an experiment and the tone seems to be very thin and hollow. Could that just be caused by the aluminum tailpiece? Prior to that, it didn't sound as thin however it was difficult to play. So he made several adjustments, not just the tailpiece. And, by the way, my luthier has always done great work. So any thoughts would be greatly appreciated.