Omg. I can't believe I didn't see this post until now. This is my field too. I was rejected by many an English Lit program before realizing that (once one of my files had been forwarded to an American Studies program) I was applying to the right universities but the wrong departments. Dundee in Scotland has a comics study program as well as Portland State. I know Cal State Northridge has a lot of comics scholars. Columbia's American Studies program is also interested in that sort of work. UChicago is also a cool place.
This is probably way too late to help you, but hopefully it might be helpful for people in the future.