the company i fly for has a flight school attached and we have an arrow IV there.
when the theme is actual i can take a look into the aom of our arrow regarding this .
what i can tell you now is that in a turbo-seneca with two 85kg guys in the front and nothing in the back you are hard on the front limit. not outside, but hard on the edge.
i doubt that the arrow even with a passenger in the back is outside the envelope, i would also point for a miscalculation. but like said - be careful and clarify this.