I had an awakening experience yesterday while cleaning up the gullets on a 20" 73LG chain that is filed back to within about 1/8" of the witness marks. Some of you guys will likely say "no sh1t sherlock", but for the rest of you this might be helpful. I was doing the clean up on a grinder with the head layed over at 50° and the vise angled to 25° like I would be if grinding, and instead of just grinding the bottom of the gullet flat like normal, I ground the gullet concave as if I were going to dogbone the tooth. After grinding the gullets I gave the chain a quick hand filing and went out and layed into some bigger( ~ 30") maple and layed into it. This chain sucked down into the wood like I`ve never seen before on this saw, G357xp, it was pretty amazing to me. So is anyone else doing this when they sharpen? I always thought dogboning the chain was to reduce weight, but there is a tremendous benefit in chip removal I`d say. I didn`t get time to try this on any other chains today to see if it is duplicated but I`m wondering if anyone else has had a similar experience. Russ