10 sec D/C should not be punishable
My friend had a bout of lag in a bot match, and even disconnected for about 10 seconds because of the lag. It soon resolved itself.
Then we go back into queue, and we are in low-priority queue for 6 minutes.
Are you targeting AFKers and Leavers, or everyone? I think 4 minute minimum before any punishment can happen. It takes a couple minutes just to quit, relog, and reconnect if you crash or glitch.