Have you tried long enough for your fingertips to start to harden. If they are still soft, maybe they are spreading out when you press the strings. That should get better all by itself. Also, make sure that your fingernails are as parallel to the strings as possible. If you consider a cross-section of your fingertip, its not round, its probably kind of a rounded D shape. This can be a challenge for some of the chords.

I have been playing/practicing for about 15 months. I remember it seeming impossible to correctly play the open D chord without muting the G or E when trying to hit the B. I didn't change anything in strategy but now I can throw it on there with relative ease.