+ 65 grains in broadhead weight would definitely alter the arrow's foc significantly. It would also require a stiffer arrow spine.... unless someone was already shooting an arrow too stiff for his setup.
I would say that it is scary how we sometimes think alike Arthur. I would tend to believe this to be the case. If the arrow being shot is an exceptionally stiff spine for a given setup then even increasing point weight might not be enough to offset the spine for that setup. 65 grains does seem like alot though.