Although we do know cam type, we do not know draw length, bow poundage, arrow length, point weight, fletching type, arrow rest. Makes it impossible to diagnose proper arrow spine. Especially over the net!
A 400 spine (Beman 400 ICS) is kind of a meat and potato arrow. Commonly tuneable in set ups used by average adult men. If three different techs at three different shops have said arrow spine to be correct, we have to assume it's within your dynamic spine parameters.
This leaves fletching contact, form, bow and cam specs, center shot.
Dont know what rest you shoot but when single cam or hybrid cams are introduced to full containment style rests like whisker biscuits you can more times than not throw the old standard stiff arrow weak arrow paper tune indicators out the window.
Good luck this season Yote!
