I just break the bottom and rear edges with a sanding drum, then polish lightly with a Cratex bit. I don't notice it so much on the J's but K's with heavy magnums were 'enlightening' as to where all the sharp spots were.....
I do use a high hand and high thumb hold, and I am unwilling to change my grip. Grinding the sharp edges off did the trick for me, and in many many tens of thousands of rounds I have never released the cylinder accidentally even when a chunk of hide is removed.
It may take a day or two but I will try to get a pic up of the grind.