LiPo explosions are scary and happen fast. If you are going to charge at higher amp rates always have them in a LiPo bag.
I highly recommend balance discharging for 2s or more. I believe that your batteries will run better longer if you do. I personally use a iCharger 4010 because of its ability to do that. It will discharge a 2s at 17a while balancing. Something like 140w/channel of discharge capability. Worth the money.