Some numbers and results that may (or may not) help you make a decision:

Gold Tip Pro 400's shot from a Bowtech Patriot single cam at 67#
7.4G/inch
Shaft length is 25 3/4
Factory inserts
Gold Tip unibushing with Easton G-Nock
5" feathers
100G tips

FOC is 10.6%
Weight is 344G

I can manage 3" groups with these at 40 yards when I know I haven't blown the shot or the wind hasn't played factor in aiming. Accuracy drops off past 40 yards - a product of the large feathers no doubt, but maybe 3 inchers work better.