I have struggled with tongue bite. I have a rare neurological disease that makes all of my nerves, including those in my mouth, very sensitive. Maybe this is known by everyone but me, but I have discovered that besides having a large draw hole in the shank so that I am very gently pulling with barely any effort, if I put the bit deeper into my mouth than normal and place my tongue flat on the bottom of the bit, like as if I am going to lick it off, it eliminates ALOT of tongue bite.