I ended up unraveling the oversized computer mitt. First I made the 2nd one, leaving out the stitch increases and making sure my stitch counts were accurate. I still haven't done the picot edging, but the fit is MUCH better. So last night I unraveled the body of the first one (kept the cuff), and started re-making it. It's about half done now.
Note to self - picot edging does not unravel easily!