Finally had more time this weekend and found the last heart piece at the minecart mini-game, cleansed the heavens and all is bright & dandy. I'll give the Hero mode another run through when I'm finished a few other games.
Concerning the controls talk. I haven't experience any calibration error while playing the game. The only problem I've had was with the recentring of the pointer for the map or with the bow pointing downwards after those secret sequences; but those are easily fixed by pressing down or pressing B for the latter.