Can i just say that picking a white is so much harder than picking wall colors.
If you can get your head around the fact that every white paint color belongs to a hue family, the task becomes incredibly simple.
It gets even easier if you understand value (meaning lightness not LRV) and chroma. Chroma answers "how gray or colorful is this color?"
The process is pretty straightforward, it's about color relationships. Figure out the hue families of the biggest most important elements in the space and choose a color of white to coordinate.
For example, all of the colors you mentioned are in the same hue family neighborhood. Here's each color with its hue family notation:
Halo - 8 Y (yellow hue family)
Gray Owl - 10 Y (yellow hue family)
Moonshine - 1 GY (yellow hue family)
White Wisp - 3 GY (green-yellow hue family)
Paperwhite - 3 GY (green-yellow hue family)
Horizon - 3 GY (green-yellow hue family
You have two choices. Choose a white from the same hue family neighborhood or choose a white with more contrast.
What do you want? Do you want the white to kind of "pop" against the wall colors you've chosen or do you want a softer, calmer degree of harmony?
From what I've read, you don't want a white to pop because you haven't cared for the whites that lean too far towards the green hue family or too far towards the yellow hue family. You also haven't liked the whites that are less colorful (stark) and close to a true, neutral white.
It sounds like you want a softer, calmer degree of harmony. In which case a very strong contender is Snowfall. It has twice the chroma as Chantilly Lace which means it's not as stark. Also, its hue family is within the same tight range as the wall colors you've chosen -- which is why I think you picked it out of the crowd of whites. In other words, Snowfall technically goes with the wall colors you've chosen.
Based on that analysis, it'd be worth investing in a sample to test it and see what it looks like with the wall colors and other important elements in the space like the counter top, floor, etc.
Here's a color wheel that illustrates hue families so you can see the Y (yellow) and GY (green-yellow) hue family neighborhood I'm talking about.
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White paint and trim
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