Hi Black5tar,
PhD Programs tend to be highly competitive, since the number of available 'spots' is low and the applicants tend to be highly qualified overall. As such, a high GMAT score is almost always required (even if it's not explicitly stated).
From your post, it's not clear how you studied, so I have some questions about that and your overall timeline:
1) How long did you study?
2) What materials did you use during your studies?
3) How were you scoring on your practice CATs (including the Quant and Verbal Scaled Scores)?
4) What application deadline(s) are you facing?
The GMAT is a predictable, standardized Test, so you CAN train to score at a higher level. Some adjustments to your study plan will clearly have to be made though and you will likely have to invest in some new study materials and learn/practice some new Tactics.
GMAT assassins aren't born, they're made,
Rich