Asym tarps like the poncho or the Hennessy have their drawbacks and I won't deny it. Good site selection and pitching skills help out a lot, especially in stormy conditions. I learned the hard way about site selection in my Hennessy, but those experiences have made me a better hanger and tarp pitcher.
There are some other threads that discuss the virtue and vices of ponchos so I won't go into them here suffice it to say you'll need to hone your pitching skills. Not that pitching the tarp itself is hard--an asym tarp is the easiest, quickest kind of tarp--it's the relationship between the hammock and the asym that takes skill.