Warp,
I just looked down my barrel, and think that may be a really poor way to tell anything. Depending on how my eye was centered, I could see any part of the chamber I wished.
If your smith has a range rod (or you) that might be more of a quantitative way at comparing the centering or gap. I picked one up just to have, and was not expensive. The range rod is the proper way to address cylinder mis-alignment. For myself, had mine come in with a rough FC, I had decided I would address it by polishing or possibly cutting a different angle. But I like smithing, and love to tinker. Depending on what you like to do or fiddle with, sending back sure seems to make sense. If you think the FC is cut off center, polishing might help leading, but not help accuracy.
I did almost a week's worth of research on the web, and had pretty much concluded that PC is more of a features thing, and less of some mastergunsmith turning out a custom piece. I would tend to think that the differences between the PC and JM is features, and either one could have cosmetic or functioning issues. Mine had two easily remedied issues for someone half handy.
I had my PC out again yesterday for some reasonably serious accuracy and load checking with 45 Supers. At 25 on a bench with a red dot, groups in 45acp were ok with plinking Ranier plated 230's. With 255 grain lead SWC's moving along at 1000 fps, the bullets were stacking on top of each other, when I was bearing down. I was also checking velocity, recoil, red dot centering, etc so not a pure accuracy session as I had a lot going on, but my PC looks like it will run right there with my FA in 454. I had to hand fit a Kart barrel to my Colt 1911 to get it anywhere close to what this PC will do out of the box. I am a happy camper, so far. I do wish you luck with yours, and your decision.
Craig