very happy with my V2 Touring 12x2 HS...
Joe, you said narrow the bottom of the brush by 0.3mm... do you really mean 2 tenths of a millimiter? that's close to a hundredth of an inch... do you confirm? sounds too small to me.
Is it worth doing on 12 turns on tight tracks? I'm running sprint brushes btw and they do make a BIG difference...
Thanks,
Later,
Paul