100% agree to all you said. I would add Whitney Westgate to this. She treated cum like it was toxic. When she gets any cum on her face she looks like she wants to cry and wipe it off ASAP.
I just went and watched a cumpilation video and some of the facials were exactly like you said, but a bunch were her looking pretty enthusiastic and taking it on the face and in her mouth with her eyes and mouth wide open. There were even shots of her licking some stray um off of her tit.
So maybe she relaxed and embraced it on later in her career or felt more cum comfortable with certain performers.
Regardless, she was one of my favorites and was really excited when she finally did an anal scene for Tushy, but she disappeared shortly after that. It would have been awesome to get a farewell DP scene like we got from Eva Lovia before she stopped doing regular work.