In a little POA/POI testing yesterday that I forgot to put in my journal, the T-CAP front paired with an Operator rear got me the same accuracy on a B-8 at 25 yards that I get with any other set of sights. FWIW.
I appreciate all the thoughtful feedback in this thread. I think I'm going to keep the HDs on the guns that have them (at least for now) and see if I can't do better with more practice.