I'm using an old Blue-Point split bar tool also. I agree with Mike. My dad taught me to use a fine flat file to dress the cut prior to flaring, and not to torque down to much on the double flair. Of course today i'm sure the quality of the tubing comes into play.
I also looked at the Eastwood turret tool. Too spendy for me at this stage, (if I were 20 again, I sure would!)