Not a bad thing to have more amps on tap, however you really need increased voltage to get a wider range of low distortion power.
Gleaned from the TI TPA 3116/3118 factsheet:
12v will only give you 7-8 watts @ 8 ohms before you hit a wall of distortion.
14v will produce 12 watts @ 8 ohms
19v gives you 20 clean watts @ 8 ohms
Upgrade to 24v and you'll get something around 30 watts of low distortion power, also @ 8 ohms.
THD varies slightly with voltage, but doesn't appear to be consistent, thus, I doubt any one voltage is actually better than another within a given power range.
Certainly, I don't hear any difference.
Push things to the point where you're drawing 7-8 amps of current and the power protection circuit [PLIMIT] will trip.