Cathar:
I believe that JoeC mounts multiple times, as shown
here
In principle he should get less variance than Bill or I because of his clever method of mounting.
From a statistical standpoint, throwing out all mounts other than the best one is a bad idea. A medium to large sample and a mean + std dev is much more logical. We have different goals though; you want to see maximum possible performance from a block and I want to see minimum chance I am wrong about recommendations
