I don't think you would be accepted into a post-bacc if your Bachelor's is already in Communicative Disorders. A post-bacc is made for people who did their undergrad in another field.
I agree that doing a post-bacc would not make sense, unless you are missing some classes, I'm not even sure if you'd be allowed to join a post-bacc since your degree is already in that field. The best thing you can do is strenghten your application with higher GRE scores, volunteer expereince, and strong recommendations. Applying to different schools is also a good idea, I have read a lot of people who keep applying to same schools over and over, and I don't know if that's the best idea.
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