Ringoblack I think you are right--spine orientation seems to be different between the two shafts. I put a weight (3 lbs) on the two to see what deflection I got. The 10* deflected 7.5 inches wrt a fixed baseline and the 13* deflection was at 8 inches. .... , but I think it still proves something.
It really only proves that you have a 3 pound weight lying around. ☺
Graphite shafts are always sanded. Table rolled shafts (often with a heavier spine) more so than filament wound shafts.
You also might not have used the same clamping pressure as a result of one shaft being thinner in the butt than the other.
Only one way to settle that. Have each club FLO'd. It will show frequency number as well as if one is wildly different when it starts looping all over the place.
