I am returning to the double bass after many, many years off. I live in a tiny remote rural town and bought a bass (Carlos Lamberti Sonata 2016) online with only a video and some pictures to go by. I have been working on the tone now for about a month. I bought a CF french bow from Gollihur Music that feels great and plays well. The G string sounds bright and clean all up and down the finger board, but the D string sounds sort of muted or muffled just about anywhere, and that goes pretty much for the A and E strings as well. I realize that there may be many factors to consider--the room, humidity, my fingering, just to name a few. However, at this point I am particularly concerned about two points. First, it appears that the strings are too deeply notched into the bridge, and secondly, the bridge appears to be warped slightly toward the tail piece. The feet of the bridge are solid; can't slip paper under the feet anywhere. Do you think these factors could be causing the tone problem?