Trek sole and narrowing at midfoot ("curved last")

[acc]

I noticed with the Trek I bought my brother and the Bormio that I just got shipped to me, that the midfoot narrows inward much like the Merrell Barefoot.

The bone at my midfoot (cuboid?) extends onto the foam instead of the sole (under where the Bormio zipper is). This doesn't happen with the other soles although the Bikila seems to smack the Vibram logo at the rear of that position instead of more tread.

I haven't experienced any pain after a half day of wearing the Bormio, but it might end up on the "Buy/Sell section" here if that happens.

http://birthdayshoes.com/media/blogs/photo/KSO_Trek_Unboxing2.jpg
http://birthdayshoes.com/media/blogs/bdayshoes/Vibram_Five_Fingers/komodo/komodosport/mens_komodo_anatomy.jpg
http://birthdayshoes.com/media/blogs/bdayshoes/Bikila_Sole_Info.jpg

Does anyone experience the same thing? Or is my foot anatomy just really wide at the midfoot for someone with a high arch? (I'm E/EE wide on the Brannock device)

I find it ironic it is mentioned in http://www.trtreads.org/Chapter_7.html

Shoe Design Flaws
...
curved last: (i.e. "crooked" last) The midfoot area of the sole is cutout denying use of the 5th metatarsal ray, which is naturally a weight-bearing bone.

and
  

 A straight last is appropriate if you are an overpronator or have a flexible, flat arch. It helps to control inward motion.
    A curved last is designed for underpronators with rigid, high arches. The curved shape promotes inward motion.
    A semi-curved last represents the middle ground. It is appropriate for neutral pronators.

http://www.rei.com/expertadvice/articles/running+shoes.html

REI's definition of a curved last is different than Two Rivers treads. Two rivers treads defines it curving in at the 5th metatarsal side, not where the arch is.

[UberC5]

I have 2 pairs of Bormio, both in M42.  One pair has no issues in this area, and I wear it with socks and can't even tell it's on my foot.  My other pair seems like it will never be comfortable with socks, and for now is barefoot only and even that is tight sometimes out near that curved last.  My M41 KSO Treks have no issues whatsoever, and are extremely comfortable with or without socks.  My M42 Trek LS(granted very little mileage till Spring) don't seem to have as much issue as that 2nd pair of Bormio, but aren't as comfortable as the first Bormio or the KSO Trek(yet). 

It's funny you mention Merrell.  I have yet to put on a Merrell that feels good.  My NB Minimus MultiSports are awesome in EE width, but every Merrell I try feels like Torquemada is doing the fitment.