Here's something to think about re tip overlays, not wedges. They add a few grains to the limb tip, but also have the effect of moving the limb tip 1/8-inch or so farther forward (i.e. increase the setback), adding that much more early load to the limbs. IMO, it's a wash. I like em because they look nice.
Long story short, the limb tip wedges are sufficient to enable a Hill bow to handle a fast flite string with ease. Limb tip overlays aren't necessary, but they look nice and don't detract from the bow's performance. It's a personal preference thing. Go with what you like to look at knowing either will work just fine.