Test For Consistent "Cameo" Reflectivity

So, I've been frustrated recently trying to understand the TPG's "Cameo" Designation.

Utlra or Deep Cameo is pretty easy, we're talking blast white devices from all angles. I've seen a number of coins from all of the TPGs that show a questionable lower limit for this, some coins that wouldn't rate cameo in other situations, but consistency with Ultra Cameo is better than with Cameo.

With Cameo, it's all over the place, it seems like. Could be changing standards, I don't know.

But I suggest a reflectivity test.

There is a reflectivity (newsprint) test for PL and DMPL (Morgans), so why can't there be a reflectivity test to bring Cameo into more consistent grading standards that are easier to interpret.

I've head all sorts of definitions.

Here's my suggested one. For Proof coins (could be classic, mods, if this is in the wrong place, by all means move the topic!)

No Cameo:
Reflective or non-reflective surface (hazed, et cetera)

Cameo:
Both sides:
Clearly reflective fields through 4" or greater
Non-discernable (color but no distinct shape) reflective devices (all devices) to 2" or less

(this is completely debatable!)
OR:
IF one side of coin is Ultra Cameo, the opposite side must have some cameo effect, Non-discernable (color but no distinct shape) reflective devices (all devices) to 4" or less

Deep Cameo / Ultra Cameo:
Both sides:
Clearly reflective fields through 6" or greater
Non-discernable (color but no distinct shape) reflective devices (all devices) to 4" or less

Let the debate begin! I'm open to ideas!

If there is already a test for cameo, I'd love to know about it! I've never seen nor heard of it. I actually asked Dave Hall about this and he kinda gave me the "I nunno". Thank you for your input!