The U.S. transfer is not just too dark, it also has black crush, and the grading has a lot of that blue/orange dichotomy. For example, take the Ivory Tower scene; if the Derann digest clip I found on Vimeo is any indication, it did have a golden "dusk" look to it in the original timing, but on the U.S. BD, those hues seem to have been digitally pushed to the point where color detail that's not gold or orange or amber or brown is drowned out.

Here's another example. The climax from the DVD - start at 1:22. (Forgive the lower quality, it's all I could find, and the gamma seems to be too high - though that just may be the standard higher-gamma/lower-contrast look used from the 80s up until the decline of CRTs)

Look in the background whenever the lightning flashes. In the DVD clip, you can see color details like the brown wood of the shelves. In the Blu-ray, everything is shades of blue. Missing color information of this sort may well not be recoverable, even with YouToo's methods.