OP- You should certainly retake if you can swing the money and your score is likely to improve. However, these scores will certainly not disqualify you from admission. In fact, Iowa explicitly says they look for 70% in both, or a much higher score in one to compensate for a lower in the other (i.e.- your scores).
For the programs you are applying to, these scores will not be the deciding factor. The rest of your application is more important.