What you are describing sounds more like default calibration content favoritism. With any projector that isn't perfectly calibrated (and almost none are OTB, even if the Mits is close in some ways), it will introduce BIAS often only noticeable on certain content.
It is more than likely what you were watching then as compared to what you are watching now because of your calibration favoring one over the other. Although even a few hours on a new lamp can shift color quite a bit. The Mits generally has too much RED in the image initially.
For instance, I can create a dip on the gamma curve so that certain scenes are barely affected while others are affected greatly.
With the Mits OTB calibration, some content looks almost as good as D65, but other content will still show you that the Mits isn't quite perfectly accurate until you calibrate. Most, but not all, skin tones are pretty good OTB.
The point of a D65 calibration is so that content looks as it supposed to, for better or for worse, or more importantly so that NO content looks totally off-base.
For instance, if your projector has a yellow BIAS and you are looking at someone's face, someone with a lighter skin color is going to be affected more, but someone with a very warm face may in some cases look better with the yellow BIAS than even on a D65 calibration. That doesn't mean just because one face looked better with a weird calibration that the D65 calibration isn't right, the fact is usually that 9 out of 10 faces will look better at D65 compared to even a slightly off D65 image. Some people's skin tones just actually COULD in some cases look better with color BIAS added, but it's not the norm, it's the exception, and sometimes the reason is camera lighting and too much makeup (or a bad makeup job).
I've often said it's ok to go off D65 a little to get a little higher contrast on some projectors like LCD's, but this isn't necessary on the MITS, and it is only DO-ABLE on other projectors if you fix skin tone bias with CMS or other methods, and this makes for a VERY long and troubling calibration to do so (you really need to be very patient to be able to do stuff like this).
Skin tones are by far the most important thing to me for color accuracy, I can live with color shift on backgrounds usually, but not on skin tones.