Update:
The pistol arrived at Armscor on Monday, and I got a call today. Ray (not Ivan) tells me he took it to the range, and off a rest he was able to shoot good groups only about 1 inch below the bullseye at 25 yards. He asked me what other shooting I've done, and I told him (as mentioned above) that my other pistols are a 1911 pattern and a Browning Hi-Power. He went on to say that it's possible I need to spend some time getting used to the trigger pull on the new gun.
It's true nearly all the shooting I've ever done before this was with single-action handguns, and while of course this new pistol is double-action I did most of the firing in single action mode. Ray mentioned that the differences in the shape of the trigger, and in the different trigger reset, could cause my issue. He also said that he's been an IPSC competition shooter for nearly 20 years, though I have no reason to doubt what he's telling me.
Anyone want to speak to this? They said they'd send the pistol back to me directly; I guess I just have some practicing to do.