Jam-or-fold: (near)optimal for stacks up to 10 or 11BB?

[JocK]

In "The mathematics of Poker" Chen and Ankenman state:"

"Jam-or-fold is at least near-optimal for stack sizes up to about 10 or 11 blinds"

However, based on some calculculations (see: http://base.google.com/base/a/112163...41895488656518 ) I have reasons to believe that for stacks deeper than about 8 BB jam-or-fold is no longer (near-)optimal.

I am keen to get your (and in particular Jerrod's) comments on this. Did I make some computational error? Or is my assumption that (when not limited to jam-or-fold) playing from the small blind in headsup gives an edge (for any effective stacksize) flawed?

Johannes