I too have to adjust more to lighten for FP3000B than FP100C on my 250. I have also made a work around for the camera's general tendancy for underexposure. A piece of cellotape over the electric eye coloured red with a marker pen. Measured the effect with a light meter, and it adds a stop to the exposure. Now it works more or less as one would expect, at least for FP100C, lightening only if there is a large bright area in the frame, or in contre-jour situations.