Mark, if I have correctly observed Arvin's flight bow, while it has a pyramid width profile, the tiller shape was not an arc of circle tiller with less bend in the inner limbs and with stiff tips, is that correct?
My interpretation of his winning bow was that the wide inner limbs were overbuilt to take absolutely zero set, the mid limb just wide enough to not take set or take very little set, and stiff mildly reflexed outer limbs for low mass and high energy storage. I assume the low amount of working limb also contributes to low limb vibration. Narrowing of any portion of the bow would make it more efficient for mass movement but at risk of increasing set. I have no idea how to optimize what he already made but those are my thoughts. It would almost be a different bow with too many changes.