A few of my friends said they talked to a number of sophomores yesterday who were extremely stressed and in the same situation. RELAX! It is not a cake walk to get in to every house as a sophomore, but it is possible, and having four houses is excellent!
We know who will and will not fit into our houses. Do not take it too personally that several houses cut you. (I know it's easier said than done.) Rush is not a perfect science, but the sorority women still do an excellent job of filling out their pledge classes with the girls that will most likely fit into their respective houses.
Also know that there is only one struggling house, but they had some amazing women pledge last year and people are taking notice. My chapter's advisor also said that they now have a full-time Leadership Consultant assisting them. This is really exciting for everyone because no one wants to see weak chapters and Phi Mu's successful recolonization shows that UNC's campus is open to major undertakings; I think this "struggling" chapter will be one to reckon with soon.
I will also say that when I rushed girls, I preferred sophomores over first-years. You've already been through your first year, you have a strong GPA, and you are demonstrating that you have clearly put thought into rushing. I'd rather put my weight behind you than someone who is going to (most likely) struggle to find the right balance in their first semester, if not their first year, and that can be very difficult for chapter GPAs (and images!) to manage.
GOOD LUCK!