As you are flying West Jet the connection time will be much quicker than if you were connecting to T1 and AC. As You are coming off as a First passenger, you should be the first one of the flight to get to immigration (Walk fast to ensure J and Y dont catch up behind you) and as you will have priority bags, you will find connection is not as bad as you think.

I flew Porter to Boston, but that was whilie I was based in Toronto, Porter and YTZ only caters to downtown residents from a convenience point of view. As you will be connectiong from HKG and YYZ, this would involve a lengthy taxi ride and not at all worth it! Which flight are you coming in with? CX828 or CX826?