ORIGINAL: awshucks
Attempt # 4 to post.
I am gonna make this short, as it probably won't go thru like the other 3 trys. Danny Miller only sells the LII's w/ 4" vanes and brass inserts vs. alum. 357 gr vs. 431gr. Email me for full story, but I'm here to tell ya, these are a winner. They are why I don't advise the Right Stuff package for new Excals, plus the fact you can save about $25. on the Varizone. My 431 gr. LII's balance at 14" from nock w/ 100 gr. points. 20" OAL for FOC of 20% according to Rebs info.
Different types of arrow shaft have, based on experience, different recommended values for the FOC, ideally:
Aluminum shafts: 7-10%
Aluminum/carbon composites: 10-13%
Carbon Shafts: 13-16%