Was your screen (TV/projector) calibrated with the 83SE before the mod? If so, that would make perfect sense that you get a better picture with a modded 83SE than with the 103. Otherwise, the video processor in the 103 is superior to that in the 83SE... If you connect the 103 and calibrate your picture with that, then you should be able to achieve a picture quality that surpasses what you've seen with the modded 83SE.
With that said, the 83SE is not a bad bluray player... we're talking incremental improvements, not night and day.
With that said, the 83SE is not a bad bluray player... we're talking incremental improvements, not night and day.