I was an out-of-field applicant as well (Classics and Art History B.As w/Linguistics minor) I think GREs are probably very important. My math was horrifically low (20% percentile,) but I ended up at a fantastic school. With that said, I think my Personal Statement helped me significantly during the application process. I applied to a total of 8 schools and was accepted at 2, waitlisted 2, and rejected 4. Ironically, my 'safe schools' were not so safe (got rejected) and my 'reach' schools were the ones I got accepted into. Look at the size/reputation of the school. If it has a history of being a really big research school, you can bank that will impact the numbers. E.g. I was told that there were 800 apps for the Fall 2014 application cycle at one school. I shadowed 50 hours in the fall as well as completed 3 SLP courses (Anatomy & Physiology/Language Development/Phonetics) and also completed ASHA requirements (Chemistry/Biology/Psychology/Statistics.) This showed that I was a serious applicant, I think.