Spine recommendation please.

[Easykeeper]

Bow is a 64" Griffin, 55 @ 28", my draw length is about 28".  I just got this bow from a fellow Trad Ganger, and only have tried it with the 3-49 ACCs (390) spine) I have been using with my 54# recurve.  The 3-49s are cut 30" to base of point.  I tried 175gr. points and got some fishtailing and groups to the left of center.  I swapped the 175s for 300gr. points and the arrows group in the center, less fishtailing but not perfect flight (nock point might not be perfect).

The 3-49s are the weakest shaft arrows I have right now.  I'd like to order some new carbon shafts, probably start with something cheaper than the wonderful but spendy ACCs for now.  

Can somebody give me some advice on spine for a 30" arrow, 175gr. point, 55@28" Griffin, 28" draw length?

Thanks..   :confused:    

[Jeff Mundy]

I would try a 500 series in whatever shaft you decide on. If the .390 spine in ACC is too stiff a 400 series will be too stiff as well.