Practicing Titan, I'm find that along with my friend, we're having problems hitting his heart. It's often out of range, meaning I can't pull off combos. Sometimes if I get in too far, the game thinks I'm facing away from the heart.
It's a real nuisance to hit this thing.
Also, positioning for the limit break I have the same problem. Where's the best place to stand so it actually goes off without putting myself in danger? D: