I second this. I got 79% percentile on the Psych GRE, and I was worried that that was too low. I personally don't think it impacted whether or not I received interview invites--maybe it took me out of the running for the top top tier schools, but who knows. I think as long as you get at least 80%, then you should be okay--especially since your psych GPA is good.
All that being said, if you plan to apply to Clinical Psychology PhD programs, my experience was that most programs do NOT require a Psych GRE score. Some may encourage it, or allow you to send it, but most do not require it. Therefore, if you take the Psych GRE and don't do as well as you would like, then just don't send the score! Best of luck!