Swing question for people who play lots of hands

[elmo]

I am trying to figure out if my experience multi-tabling is normal. Since mid-July, I have played 200,000 hands. In that time, I had a 215, 250, and 315 bb downswings, while maintaining a solid WR and standard deviation of 15.1 bb/100. This is the first time I have logged this many hands in such a short period. Should swings like this be expected on a consistent basis? I'm thinking that they are unlikely, and I must be playing bad when I am losing without realizing it, but I am curious to see what other people think.

Thanks- alex