I do use a Barnhart as my playing cue. I switched to a low deflection shaft maybe 3 years ago. I started out with the Predator Z shaft. It worked for awhile but overall I started noticing my mistakes big time. If I was a little off, it looked like I was way off. That shaft is just way too skinny. I switched to an old 314 and liked it. Recently, I switched to a Mezz Hybrid II. I really like the way it feels compared to the Predator. It has a little bit stiffer hit and to me it seems like I can do more with the cueball.
I believe the shaft I have now I had taken down to 12.75 maybe a little bit less. And I use a Moori soft/slow.
jcommie, I'm not sure about the shaft you are asking about. I know Cory Barnhart makes a low deflection shaft that is layered somewhat like Predator (more layers though).
Sarah