Sweet pix Hockey ref!
I don't have any tips for you Chewy (you clearly have the photography bit down pat!) but here are a couple of pix and maybe a few ideas that you may or may not have come accross... living north of you by a few hours you probably would come accross the same birds.
* Snowgeese migrate south mid-October and then back north in mid. to late Feb. early March and can be spotted on farmer's fields east of the Rockies (tundra swans as well as other water fowl in lakes / slews around the same time).
* Great horned owls nest in the winter and the young birds emerge sometime around Feb. (cute fluff balls!)... the young hang around the nesting area into the summer.
Other nesting birds (particularly birds of prey like Swainson's hawks or osprey) can be great subjects and with your equipment and a tripod you should be able to get some good shots without getting too close to the nest to become an outright disturbance. Swainson's hawks have been known to divebomb passerby'ers, mind you, so you probably wouldn't want to get too close anyway!
* Snowy owls migrate through the area east of the Rockies and can be spotted hanging around in Jan. - Feb. Can often be spotted on power poles and on fenceposts/farmer's fields. Never seen them in the fall but they must go south sometime!
* Sandhill cranes nest just east of Waterton (Police Lake, etc.), so chances are there may be some in some of the smaller lakes just east of GNP?
I used to do more birdwatching when I was footloose and fancy-free (ie a bachelor) but have been getting back into it lately now that I have young kids. Did a few days of birdwatching last week on our annual winter trip to TX.