Book Report Size 7 — Sleeve doesn't fit into armhole.

Believe me, I hesitated before starting a separate post about this. I'm sure it's operator error, but I can't figure out what I might be doing wrong! Earlier I posted in the "Odd placement of notches" topic, which somebody else started. At that time, I wondered if I had matched up the notches incorrectly. The fact is that the sleeve seems too small for the armhole opening. Not only that, but the notches don't align. It is as if I'm trying to put a sleeve one size too small into the armhole. Here's what I've done. I fudged that dress and finished it (Book report in green) and immediately started another one in the same size using a fabric that is very stable. I have been as accurate as I can, and everything's been great up until the setting of the sleeves. I tried the flat set in the last dress, so I tried the inset way of doing it in this dress. But either way, the sleeves just don't fit. I just checked to be sure I had traced the right size. I did. And I marked the seamlines, taped pieces together where needed and then "walked" the sleeve over the armhole on a transparent surface (window), and no, it just doesn't fit. Overall the sleeve is about 3/8" too small, but the notches are off, too. Can anyone help? I know I'm going to feel like an idiot when somebody points out the obvious, but... oh well. If the shoe fits! This is a size 7, and every other part of it matched perfectly. Thank you!!!