Steamroller, you probably checked this already to see if it's a possibility but since you didn't mention it here goes;
Aren't the linings on the front & rear shoes for a wheel different lengths? I was thinking that maybe you put two shoes with the longest linings on that one wheel. I can't remember which is supposed to be the longer lined shoe but take a look at the linings on the shoes on the other front wheel & see if they're different lengths and re-check the ones on the wheel you did. Anyway I hope it's something as easy as that.
You should still have enough room so the drum doesn't drag with the right shoes in the right place. Let us know what you find.
Jacques

Let us know what you find.
Jacques

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