Low Limit Online Poker Downswings

[Strat6]

I don't keep live game stats so I have nothing to compare this to. I'm a new online player (7000 hands) keeping Poker Tracker stats. Had this downswing in 2/4 limit game recently....

Total Hands 934

Vol. Put $ in Pot 18%

BB/100 Hands -12

Went to SD 29%

Win at SD 57%

450 bucks seems like a lot over 934 hands considering I didn't play a large number of hands. After reviewing each hand, I can attribute $60 dollars in losses to playing some crappy starting hands. But that still leaves win rate of -10.5 BB/100, which I have a hard time chalking up to bad play. So question is, is that an unusually bad run of cards? Or is it within the expected variance for a basically TAG style of play (which I have no clue how to calculate)?