Mist cooling probably a non starter, but you could just blow air on it. I made an aluminum heat sink for stainless cards, Helps a little and keeps the card in focus (or defocus) . Better to just get your settings dialed in. And find a customer for $10.00 stainless business cards. I have some titanium cards from a guy up in NW Washington, Really get nice color but spendy.
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Maybe one could use an array of water cooled CPU blocks.
May help getting rid of the temp variable to reduce/decrease the color variation. 
I’m waiting for the ComMaker 60W MOPAs to go on sale again so I can try this out. 
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Just upped a ss business card cost to $10.00 ea 
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Hey! Thanks for the samples, but when I tried that on mine, I got nothing like those. LOL Must be the material. 