I think I might just roll with the 7.5, after talking to the guy at Alden DC my option was wait 8-9 months for the next order (since someone already claimed a 7.5 E on the current order) or go with a size 8. It's not terribly tight, just sorta snug only at the widest part of my feet (around the ball of my big toe).
What boots are they...I am between 8 and 7.5 in barrie last. I tend to go down to 7.5 in shell cordo shoes (my #8 chukkas are 7.5), but fit 8 in calf. My chukkas in 7.5 shell felt tight in the same place but after a couple wears they fell right on the money.
FYI...I tried on a barrie LWB in shell #8 and they were huge, larger then many of my size 9 shoes from other makers. But my other calf Barrie last shoes fit fine. So never know until you try on.