That was my supposition, Kahuna75,but I had hoped someone had a formula or the like. The ball of my foot rests slightly behind where it should in the 10.5, I'm just concerned about the instep being too low with the 3/4 length Superfeet I wear. In a blucher it would matter less, but the shoe in question is a merlot McAllister v-tread I bought during the last sale. Fantastic shoe, just not sized quite right.
Thanks though. I'm going to exchange for the 10EEE. At this point I occasionally find myself shopping cheap flights to Chicago for the sole purpose of having a "master fitter" finally help me figure out what my sizes are once and for all. I'm incredibly jealous of those of you who were blessed with normal arches/pronation.
The McAllister and the Strand are similar for me in that I went from 13D to 13E down to 12 eee with the 12eee being perfect...that was an eye opener for me.
Also just got the postcard for the May 12th seconds sale 15-30% off.