Based on the photo, the waviness on the upper edge seemed frame related to me when I first saw it. Sounds like there may be additional bubbling also, which could also possibly be caused by not removing all the air pockets during the linen backing.
Terry, as I and others have said in framing threads, waves like that can be caused when the frame is too small for the poster and/or the poster is held in too tightly by the frame hardware - it seems to be worse with the metal curved clips on metal frames.
Vick, when I first read that I thought you were going to say Dario. I don't recall where in Canada he is but there are a lot of good reviews about him from folks here. I was just checking the backing to the future website and it looks like a good place. Personally, being in the USA and from prior work I've sent to several companies, I'd send it to Poster Conservation. They did excellent work on modern glossies, similar to Terry's poster, they are good people, have good prices, etc. I also really like Poster Mountain.