Problem is, I can't see the black. It's just fuzz, so my shots are typically high beyond 20 ft because I wait to see the sight.

Whether the dot is over the top of the blade, or inside the "U", it all looks the same.

At least with the CORE, I can level out. And I do use the two thumb forward. However, when my barrel gets hot, the weak hand thumb gets burned on the take-down lever, as that is where it rests.