Dave,
I use an Ace spin / spine tester and put 1 bearing block right at the nock and the other as close to the base of point as possible. It still takes time.
My thoughts on fletching...adding offset or helical can slow down an arrow by creating drag, drag is what stabilizes the arrow, not the rotation created by it. Take a good flying arrow with a big blade up front, why do you want to slow it down by adding excess drag. Do you really need, or even want, that blade trying to twist as it penetrates ? I put large fletches on straight, this offers the arrow quick stabilization from paradox and if perhaps you have a bad release, or maybe the arrow combination isn't tuned perfectly to the bow. A big fletch will also tend to hold up and offer enough surface area to be of use when wet. I feel that the energy lost to trying to spin a big blade in flight is wasted in most cases. I would prefer to have a flater trajectory and more energy to expend on actual penetration.
Rotation induced by a single beveled blade on impact is another matter. It seems to have proven it's worth on heavy bone and probably causes more soft tissue damage. I do think with a flint or knapped point that has basically a serrated edge that it could be detrimental and cause point failure...breakage.