Variance In Turbos

[-Skeme-]

What should the typical variance for Turbo SNGs look like? I'm a regular in the Stars $15+1 Turbo SNGs and it seems like I fall into 2-3 day downswings every week. Typically I'll bubble a lot, get bad beaten, repeatedly run my AQs into overpairs and AK, and AKs into overpairs, and just keep making very good second best hands.

What am I supposed to expect? I'm pretty new to the whole nothing-but-SNG thing as I'm primarily a cash player.

My ROI is like 14% but only after about 220 SNGs, so it's not too accurate.

Thanks.