I decided to remove the airdam, make all new brackets for it, and refit it properly. The advantage is this time both sides line up perfectly, which will help with installing the fender flares, and that it's more secure now.
I also closed a deal with a guy in the states for shipping me his IMSA 3-peice spoiler for $180USD which is a solid deal in my opinion.
I also found an ebay listing for louvers! I contacted the seller and he said he'd be willing to ship to Canada. I've set my calendar to give me a reminder Saturday at 5pm so I can snipe the auction.