Honestly I'm using an EZ-V as a sort of single pin sight. I always align the same two horizontal lines with my target and then stare at my point of aim with it centered between them. It helps me in two ways. First my old eyes have some issues seeing a pin and target at the same time. I really like the open view I feel like I have using the EZ-V.
Second it helps me with target panic. Since I'm not trying to time a release with the pin coinciding with the target its easier to just pull through on my own time.
I rarely set up to shoot more than 30yds so the "single distance" method works just fine for me.
Rules don't apply to legends!
Hahaha I know you don't want to admit I'm right on the single pin, so you can use the single pin disguised as an EZV if you want
I noticed a similar phenomenon at short distances with the EZV: My groups were tighter at known distances under 30 yards than they were with a pin. I mean, we're talking about 2" versus 2.5", nothing dramatic. But certainly consistent across a lot of shots.
I have a theory on why, and it seems backed up by some evidence. I think it's because at 10 yards, my pin is about a quarter of the size of the 2" bull on my target. I'm trying to micro adjust before shooting, and "aim small". With the EZV I can't do that. I'm subconsciously trying to hold the bull in imaginary center, but I'm not actually thinking or deciding through it. It's just happening.
At any known distance past 40 yards, my groups with EZV start to fall apart and get unshootable at 70/80 yards. At 80 yards my pin is as big as the 6" bull on the target. The shooting gets back to more "feel" over "aim". I routinely get surprised when I shoot 5 arrows at 100 yards and I just KNOW 2 or 3 of the shots weren't "good" shots, and that I'll be barely on the bag. Then I walk up to the target and there's 5 arrows in a 12" group.