Interestingly enough, i see people board out force all the time against canadian, i think it is strictly wrong. The matchup is all about maneuvring yourself into a board state where you can resolve tarmogoyf/tombstalker/liliana. From then on it is usually smooth sailing. The games you loose are the ones where they keep you from playing magic, and force helps greatly here.

I win alot of games where the key play is forcing a daze or force on my goyf to stabilize. Sometimes you also need to protect deathrite shaman, though that is a bit desperate.

I usually board out anything that costs 2 or more mana that don't interact with the board. I.e. sylvan and hymn to board in any cheap removal i have lying around in the sideboard.