I would look up www.ellsriverblackbearhunting.com , In winter i work in the area that they guide in and i have seen quite a few big moose and lots of wolves. I'm not sure if they guide for moose, but if not ask them who guides moose in that area. In my opinion for big moose you have to get away from the crowds.
Or you could possibly try someone in northern sask like www.shaddlakecabins.com , hunting from a boat is best for moose in my books.
But as always talk to previous clients and find out what the real deal is.
The record books, that are put out by Boone & Crocket and Pope & Young and where I live is Henry Kelsey they are a great way to research a state or a province for big game. This does take some time but the knowledge it gives you, can be very valuable. Not all hunters have their trophies recorded, as where I live after the Hanson Buck became the new world record typical Whitetail, we saw a flood of hunters and now that has happened, some hunters are shying away from the record books but...