ADDENDUM: THE MYTH OF HIGH VARIANCE
The problem is thinking in relative terms. If you think in terms of buyins, it's going to seem hellacious as the 1/5 stack moves back and forth alot. However, one should compare to big buyins and playing fullstack. The swings are miniscule then. Like I said, I suck at shortstacking. Yet, here is a graph of August where I ran below average (like 1.2ptbb/100 when it's normally 2). I printed this graph out and have it posted on the wall behind my monitor to remind me what a crappy month looks like. All in all, it looks like a good limit player's graph.
notice how the biggest downswings compare to playing fullstack