Re: the date change, mid-October is a far better choice, on average, than late Sept. I ran seriously on the roads in Toronto from the late 80s to the early 00s, and mid-October typically produces the best weather for the longer races. It used be to the date for the old Toronto HM--- which, in spite of being a loop course with a big hill in the middle, produce quite a few times in the 1:02-04 range. Late September, particularly these days, is more likely to deliver heat and humidity. Alan made the correct call with the date change, and time will bear him out.
Hope for the best with the winds, boys, and be smart!