Another one here saying you should change your meds. Your symptoms sound very much like mine were, and there should be more improvement than what you describe. I changed from Pentasa to Mesavant (due to my CD being all in my colon), and have just been advised by my consultant to double the dose to the maximum. If that fails then I will have to try steroids or azathioprine.
I posted my worries about things on here recently, and the main thing people said that hit home was that if I don't get on top of this when it's relatively mild, then it could get much worse.
I had been thinking that even though I was not back to normal, everything was much more manageable. However, all the while that you have any symptoms, there will be some degree of inflammation there, and chronic (even low-grade) inflammation can lead to permanent scarring of the intestinal lining.
The advice I got from more experienced forum members made me realise I have to stop resisting taking more meds now, so I can hopefully have less problems in the future.
I hope this helps.