EFOC is doable with wood shafts, but it is a bit of a challenge. As has been said above, EFOC requires a light, stiff shaft and heavy point. So far, the best I have done is 21.6% with a 630 gr arrow. Those arrows are Sitka Spruce shafts, about 12 gpi, 28" BOP and 70 lb spine with 50 gr lead up the nose and a 190 gr VPA Terminator. I shoot these from two of my bows, a 53@26 Pronghorn TD and my 55@26 Robertson LB. It took quite a bit of tuning and trial and error to figure it out, but I really like the results. I'm continuing to work with these and will be refletching with some smaller fletch to see how that works. They are 3x5" helical now.
Ed, give me a call and I'll help as much as I can. Depending on your bow weight, arrow length and depth of cut, you can at least get close.