I tried the drill bit trick for the first time two weeks ago. My shafts had been out in the cold garage and the first time it did indeed split the carbon shaft at the point end. I was using a drill bit that was pretty loose inside the shaft too. I had to swing the bit/shaft combo probably twenty times before the insert came out. So the next time, I brought the shafts inside the house and let them sit overnight so everything (shaft, glue, insert) would be room temp. I then used a drill bit that was a better fit for the inside the shaft. I figure if it's too small of a bit then it might transfer the energy sideways and thus cracking the shaft. No idea if that is true or not, but it sounded good. Anyway, that second attempt with room temp shafts and a bigger bit worked like a charm. Only had to swing the shaft twice and it came out. Of course the downside was that the insert came out 100 mph and bounced off of everything in my shop before stopping. Lol! Be careful. I would suggest wearing eye protection and don't swing the shaft towards a window or other people. Seriously, it came out like a bullet. I was probably swinging way too hard and won't do that next time, but just be warned.
If all else fails, I figure it's a good excuse to just buy and make up some new arrows. Lol!