I have been looking for some tips on sanding but was wondering, has there been any kind of extensive test to blades sanded with different grits, inside, outside, both inside and out, etc to see what the best overall outcome is? If not, what have you guys seen that works best for you for both LED and string blades? I know sanding can make a huge difference so I'm surprised i havent seen more extensive testing done (from what I could find anyway)