I finally got the flavor and consistency I wanted. Just like the restaurant. Now I'm embarrassed that I ever bought it because it's only about $1.50 for a pound.

Used Cabot whole milk Greek yogurt, the juice of about half a small lemon and about a half teaspoon of salt. Let it drain wrapped in cheesecloth for 12 hours. Perfect.

I do think that the brand and type of yogurt makes a big difference.