This is the video of the first flight of my 3DR Arducopter with 880kv Motors & 10x45 Props and default PID. The drift was due to heavy wind and also I suspect a faulty ESC for motor #3 causing it to spin slower than others. It might also be due to tilted Motor mount.
I had replaced the suspected ESC with a new one. Will try a flight today to check if the problem still exists.