I recently replaced an old, clog prone toilet with Toto Drake. It works very well, never clogged since installed about 3 months ago. With Toto installation and new problem developed. When the tank fill valve shuts off after filling the tank, there is a loud waterhammer noise in the pipes. This was not an issue with the old toilet. Closing the fill pipe shutoff valve slightly decreases (but does not eliminate) the waterhammer and makes the tank filling noisier. I installed Sioux Chief mini-restor ballcock and it made things better, but waterhammer noise is still there. Would a second mini-resor( 2 in a series) help? Any other advice? Thanks you.