"I usually double bag with an opsack mostly more out of concern for odors permeating throughout my pack during the day, rather than for security from beasts while hung. This might be over-paranoid, but I don't like the idea of, for example, my insulation layers(which are usually on top in my pack with the food) coming out with any food odor no matter how faint."
Nothing paranoid about that. It's good practice. It also helps avoid attracting attention to bagged food.
If you're going to hang your food, an Ursack is unnecessary and potentially counterproductive. If a bear does manage to down a hung Ursack, they will be able to drag it away and go to work on the aperture at their leisure. Sooner or later, they will work the knot loose if it isn't closely secured to a tree trunk, large branch, etc, where pulling on the Ursack only tightens the knot and the aperture.
Edited for content "and the aperture".