That Boise slab sounds like my uncle's cabin floor up in McCall. He fought leveler for two decades, called it watered down concrete. Then a 600 sq ft shop pad had a 3/4 inch dip from the door to the back wall. He poured and shut up about it real quick. Sometimes the old way just costs you more time than it saves.

Lol so I've been sending spam to myself for two years basically

Understand the doubt. Vinegar in pie crust sounds weird but it works. It keeps the dough from getting chewy. My family swears by it too.