DAS is basically the speed the tetris peice moves when you hold right or left, low das = faster movement and high das = slower movement
If you have it around 6 DAS then you should be fine with few misdrops, but I wouldn't go lower than that unless your up for a challenge!
:(
Thats impressive considering your low das settings.
Lowering your das allows you to move side to side quicker, check out the nullpomino guide in the forums to see how to lower it.
Also, you might want to practice CCW rotation so you dont need to right rotate 3 times when 1 left rotate will work. Good luck xD