Thanks, everyone, for the responses. I feel much better knowing this is not a problem.
I just checked it again this morning after reading your responses. It does take a lot more effort with 13 in the magazine, but knowing that this is normal I think I felt a bit more comfortable being "forceful" with it (i.e. I'm not going to damage the gun) and, while difficult, it wasn't quite as bad as I recalled.
I think the best course of action is to put a few hundred rounds through it and see if things start to loosen up.
Is the 13th round much harder to load into the mag than the 12th round?
A bit. The 1-11 were about the same level of effort. 12 was a step up, as was 13. It didn't require extreme strength, but I can see where my thumbs would get sore loading the 13th round dozen times at the range (I've since bought an UpLULA loader).
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