They're actually "off" by default. If you start the game the normal way, well, it's just the normal game. To access the Hurricane Packs, even after you've downloaded them, you have to go to the Master Ninja Tournament Section and start the game from there. Even after you've started a Hurricane Pack game, you can still start a regular game by going through the original menu. It doesn't overwrite anything, it just gives you the option to play it a different way.
And about HP1, in my first couple of playthroughs of NG I didn't upgrade to Unlimited Flawless, but I have for the HP1 (which sucked because it was so expensive >_<) Anyway, it's pretty crappy! Maybe it's better against the bigger/slower enemies like the big skeletons and stuff, but right now against the pink demon guys I'm better with the Flails (which rock btw).