I made my first box call based on the Neil Cost design. I need more work on my checkering to get it more uniform. The box is Poplar and the paddle is Jatoba or Brazilian Cherry. Before I put chalk on the paddle I was getting pretty good sounds from both sides of the box. However, when I put chalk on the paddle the right sound board on the box went completely flat in sound. The left sound board still sounds good. Any suggestions as to what is going on