[desinia]

The Bridgestone Ecopia HL422 seems to be another one of those thin sidewall lightweight tires with a structure a lot like the OEM Goodyear Wranglers that are so horrible on the Element. Switching to a better designed tire might fix your swaying problem.

 

[desinia]

I doubt it. My winter tires were Toyo Open Country ATs 225.70.16 and they were every bit as squirelly. With 16's, there is so much more sidewal. There's really not a way around it.

A good trick when you're considering a tire is to look it up on tire rack's website and check the specs for known good tires on the Element vs the one you're thinking about. If most of the tires that everyone likes weigh 30-31 pounds and the one you want weighs 24-25 pounds, it's missing a lot of something. Suspect it. In this area where tires have to stand up to hot roads in Summer and deep slush/snow/ice in the winter, Yokohama Geolander ht-s is still king.