Are you driving a Sprintet?Onion Creek is beautiful! Chicken Corners is also super fun. I was just on Hurrah Pass in mid March and they had graded the road and it looked like they continued down Chicken Corners so it was much more rocky and loose than normal but not as many ledges. Should be a good time either way.
And yes, the Swell sees way more use over the years but still WAY less than the more popular zones in Southern Utah. Last Labor Day weekend we had the Wedge and Lonesome Beaver campgrounds to ourselves...crazy!