What was the OG and what was the yeast?
I won't be able to tell but I'm sure someone more experienced then me can tell you if 4 gravity points is a big deal. (I'll bet anything that it's not.)
At any rate if it's stabilized it's stabilized. Target final gravity is, according to my understanding, a target. Actual reality may vary.
Oh. and, as always, calibrate your hydrometer and blah, blah, blah.