why dont you look into getting an externship doing transactional work next semester? Then you will have a better idea of what they do. Or, you could sign up for a transactional legal writing class. Either way, if you do the W&C thing and decide its not for you, 3L OCI shouldnt be that difficult.
Oh, and I believe that W&C doesnt give offers at the end of the summer. You have to call up and ask for an offer or something (kinda weird, but I guess it is because most of their summers do clerkships). Anyway, I hope you end up making the right decision for you.