Help with Arrow Spine... Please

[Spitfire Htr]

Seems I'm on the border between 300 and 340 spined arrows. I shoot a Groves Spitfire Mag 2 set at 64# @ 28". My draw length is 28" and BOP is 29.5" shooting carbon arrows (Beman ICS Bowhunter).  So, which spine and point weight do you think I need.
                  Thanks and God Bless, Steve

[Steve O]

If you think you are on the bubble, why not put some heavier heads on and see if you can get the 300s shooting good?

[Spitfire Htr]

I've been shooting 150 grain snuffers with 100 grain brass inserts and 5 grain brass washers to get my point weight up. I really like a 3 blade head but would be willing to try a heavier head if I could find one that would give me the results that the snuffers do. Any suggestions?

[Spitfire Htr]

ttt