HP - If you can Card Break and cancel any attacks, why bother raising your HP if you're going to be protecting it? You choose HP if you're a coward and afraid to be hurt.
Sleights - Why would I waste a level to learn a move that I use very rarely? Stocks are my card breakers but I could stock anything and still card break as long as I have three level 9s. Seriously, using Ragnorak and Ars Arcanum involve a total of under 9 and it's easily card broken and you're wasting three cards. As long as three cards can card break, sleights are pointless for offensive maneuvers.
CP - Victor. You get this maxed out, you can have a great tactical advantage. Fatality, Flawless victory