FOC - what's reasonable

[Johnb317]

I'm getting ready to pull the trigger on new arrows.. if you recall I asked about 3 or 4 fletch.
Problem is, the more I learn, the more confusing things get, and I know I'm over thinking this. 
Huntersfriend web says foc 7-15% is acceptable. 
I'm currently shooting a Hoyt CE with the old Fuel cams, 68 lbs, 27" arrow and 100gr tip, and now learning my FOC has been about 10%.
If I somewhat duplicate what I was shooting I'd go with the Carbon Express mayhem 350 and run with a 10.4% FOC  a 125gr tip would bring it up to 12.6, but more arrow weight than I want.  (And I have to buy new broadheads)
OR - 
For more $$$  I could get the Maxima Red, keep the weight the same with 125 gr broadheads and get 13.2% FOC

What FOC do you find 'best', or is 10% reasonable, any significant difference between 10 and 12?  I don't have the funds to buy and test different configurations....

Wish some of you guys lived close to Bellevue, good conversation for over a beer.

Thanks

[demontang]

From what ive learned 4 fletch is stable but you can go 3 with spiral off set and get a stable flight with less weight on the rear.

I shoot 3 fletched arrow with a 13.5 foc and a final weight of 470gr. The fight with broad heads with this set up is great. I was shooting 420gr 10 foc and broad head flight got erratic to a point.
Id get the higher foc and use 3fletch but thats what my own experience has proven.

[xXx Archery]

go to a Black Eagle Rampage and you can get 14-16% FOC

[demontang]

Im shooting goldtips with a insert weight which can be used in other arrows. 

[et1702]

If you want to keep 100gr by you have just buy brass inserts to increase FOC. I shoot mine at about 18% FOC with four fletch. But I'm also shooting 150gr two blade by. I shoot Hoyt trykon xl at 31.5 inch draw and 68lbs. They fly like darts.  The more Foc you shoot the faster they will stabilize off the bow

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