That matches about what I've found. I put a thermometer/hydrometer inside the incubator to compare what the incubator said vs. the thermometer. It seems to run about 1.5 degrees cool and as you said, about 3-6% difference on the humidity.The temp has been very consistent throughout most of it. I would definitely get a second hygrometer to watch the humidity. Mine is off by about 6%.
Edit: about 3-6% low on the humidity.