There's a vid on Food Network where Bobby Flay uses a bunch of different chili powders (because that's what he does) to cook chicken. Since I've never done this before, I tried it last night with some chicken. After soaking for 3-4 hours, I cooked it the same way I always do. I could absolutely tell a difference that the buttermilk made. I cook it just fine, but this was noticably juicier and flavorful. Something to do with enzymes and acidity. The spices give it a bit of dry rub flavor, I suppose.
Anyway, based on last night, buttermilk is probably going to be a permanent resident in my fridge. I'm looking forward to tomorrow. ( I will probably try your upside down suggestion)