If your team is near-top ranked and your offense is near-top ranked, then I assume you are winning most of your games and scoring a lot of points, correct?
Could it be that the teams you play have to "air it out" against you? The reason your defense is great against the run may be because you are usually ahead and your opponents "have to" throw and throw against you, hence the lower pass defense. It may be a "quantity" issue and not really a quality issue.
#1/#120 is about what I would expect if you are that dominant on offense.