Ok, so i think I know the issue. The right arm has a tiny bit of play in it up and down, perpendicular to the flat plane of the metal. When viewed from a certain angle, the tip can look as I showed it in the photo, or, but simply touching the arm with a finger, once can make caliper to be even with the other. There's definitely a tiny tiny bit of looseness where the caliper is attached to the arm. The other caliper has no play. I guess could tighten the bolt down. That's pretty heavy gauge metal though.

As for your question about the wheel, I had it in once, and I think both tips looked the same distance from the rim. I don't know if the wheel is dished correctly. So I held back one arm with an allen, and then flipped the wheel. That's when I noticed it was difficult to be sure the wheel was mounting the same same way. I actually dislodged the cones a little, had to push them back in, but as I mentioned, It's hard to be confident that both cones sit equally well in the V. It's basically unusable for flipping a wheel quickly and accurately. See the photo. It's a view away from the device. The nut on the left is the one I'd tighten.