I have a large grape - 7 5/8" and the AP fits me just fine. Listen to these guys and do some research on the FISD. The thing about AP is that it is very accurate and the guy is in Montreal. (Once the run was complete I got my kit in 2 days)
AM is the new FX. Although they've made some improvements it's still on the low-end for screen accuracy.
As for Windsor, we have a few guys down there, as well as London area as well.
Bottom line, don't waste your time (and money) on the bay.