I may be a bit ignorant about this, so can you clarify on what basis you think the scores are low? I think ETS rates scores that are in the 22-30 range as "good". So an average score of 90 and above is generally regarded as sufficient.
Do any of the universities that you intend to apply to state the required/accepted TOEFL score? I think your overall score is fine (just the listening part that is a bit on the lower side).