Wood is very different from carbon. I have found wood to me much more forgiving so far as tuning and arrow flight. Plus, if you leave the wood a bit long and they break while stump shooting, retaper the shaft and put on another Judo point. You can't do that with carbons.
The extra length will not have much effect on the spine of the arrows, but most guys find it distracting to have a bunch of arrow hanging out over the front of the bow.
If you are not sure about the correct spine, how about putting an ad out here seeking a couple of different shafts for experimenting. I don't know if Three Rivers still sells singles or not. It can't hurt to call and ask about a couple in 55-60, a couple in 60-65, etc