A diamond's worth across the short or long dimension of the table?
Either way, I'd have to see that in person to believe it, with a practice CB aligned precisely so I could see where your tip makes contact on each shot. I certainly can't reproduce any difference with my old z2 shafts, and nothing in the known physics realm of english explains that outcome.
Were your tips prepped the same, chalked the same, and shaped the same? Were you careful to hit from the exact same spot, and hit the first rail at the exact same spot? Were you monitoring the speed of each shot, making sure the CB traveled the same distance for each test shot? Were you miscuing with each shaft occasionally, so you knew you were pushing hitting as far out as possible? You weren't elevating the butt of the thinner shafted cue more, were you, as that would apply a little masse to the shot?
If I could reproduce that effect, I would immediately sell off my new CF shafts and go back to the z2, and probably order a Revo in 11.8 - because having that much more sidespin available when needed is a huge competitive advantage.