If they're all spined within #5 & all else is equal. I'd suspect the grain alignment in the shaft as related to the cock feather position.
All shafts are spined on the edge grain. That's where the cock feather has to be positioned. If you have the cock feathers on the flat grain, or off the edge, the spine could be significantly different.
Also 32" is way long if you're using them on a 55-60 bow. They're spined 0n 13" centers, so you need to go up in spine to account for the extra draw weight. I'd guess somewhere around 75-80 for a 32" shaft.
Shawn's great at this . . Maybe he'll clarify this problem more for you.
Build your next set like they're disposable (no multiple sealing, crown dip, or cresting etc) to get your own specs down. Then go on to the artistry. I gotta tell you though, when you break or lose one of those artsy arrows, you really get upset.
Larry