tuning questiion

[XfireZ51]

I can only answer for my motor, but I was originally running the 5s and was chasing KR. I decided to check plugs for specks to confirm. I also examined the ground strap. It was a light gray color down to the plug thread which is indicative of a too hot plug. I went 2 steps colder w 7s and the strap was now dark to the end if the strap. The 6s produced coloring of the strap which transitioned from light to dark at the radius of the strap. That's the indication of a proper heat range. Also did plug cuts.