Gytis

okay, so I recently ordered a Wildcat 40 Lb recurve, 68" and around 30" draw length, im thinking of buying some powerflight easton carbon arrows, however im not sure witch shaft size to select, I think 500 is a little too flexy, but I read some more specs on the 340 and it seems just the right length (32") diameter (5/16) and combined weight is okay too (acording to my calculations) but I need some clarification wether this arrow will be too heavy or too stiff?