1. Anything up to 2.6 Amps at 5 Volts is normal charging (but 2.7 Amps will cause problems, so the phone should be limited to drawing about 2 Amps). Since it's the phone that determines how much current is drawn from the charger (unless the charger isn't capable of supplying that much current), you can't damage the phone with a charger that supplies too much current. (Too much voltage is another thing.)
2. mwake4goten, you should be aware that the Stagefright fix wasn't introduced until Lollipop, so by going back to 4.4.2 (which I'm currently running, regardless), you lose that protection.