Ah, the old Db to Eb shuffle. Don't you just love that Db major scale. It's just practice I'm afraid and it does get easier in time, however do check out that you have the pinky keys set right so you can roll between the two.
The really hard one for me is low Bb or Db moving to low B or low B to low C.
Other hard stuff is the upper palm keys I find. Again as my teacher says, "you just gotta keep practicing and playing them notes". No magic formula.