I tried on the multicolor striped raglan to check out the sleeve.
Note: this sweater is planned to be a standard raglan pullover. It is NOT intended to have kimono-style sleeves. No matter how appealing that alternative might seem mid-sweater.
Sleeve has been frogged back to the underarm, arm has been remeasured (it is 16″, not the 20″ I got when I measured it myself; note to self: do not rely on self-measurements that were extremely awkward to obtain), rate of decrease has been recalculated, and four inches have been reknit.
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ETA: Hurrah for 4-1/2 hours of Oscar TV! The sleeve is nearly reknit and looking much more like a sleeve should look: