A little late on this.... My QTH is Michigan's upper peninsula and CU is always good here! The highest frequency will fade in the evening but I can always copy the lower two all day with respect to propagation.
There seems to be a component of the AM signal that is two tone burst, noticeable at the 30 second mark. Using SYNC this part is knocked out, SSB separates it too. I have been to Ottawa and the sigs are really loud!
It is possible there is a lower fourth frequency in the 2.3 mHz area but it is so faint I am not sure about it existence....
73 Rod KB8DNS