I would say the slides look properly exposed, I do have some over and under and they still look quite yellow.

There are some shots taken at after sunset and they look good, it is the ones in broad daylight that stink.

I am using a cheap scanner and it has been a tough uphill battle to get the scans to look representative of the originals.

Out of all the research time spent on this film it looks like a Pain in the ass, the intolerance to flakey processing and the weird color rendition certainly does not engender much faith in this film, stocking up on Ektachrome 100VS and Velvia is a better idea.
I will try "Cross Processing" the CN-200 in E-6 and see how that works out.