I noticed the rattle noise in my 5K is louder when the timing is advanced more.
At 20 degrees its fairly noisey, and setting it to 10 degrees is OK, but the noise is still there.
I drove it daily for 9 months after setting it to 10 degrees, and the noise became progressively quieter, especially when highway driving, but it was because the timing went out to 0-5 degrees.