I made my own yogurt for a while and lowfat always worked best. High fat (full fat, extra fat, whatever) always turned out bad. I'd just eat the lowfat and maybe mix some cream into it. Or just buy real sour cream if you can find it (not easy) or creme fraiche or cream cheese. I'm betting you can't find unadulterated versions of any of these things (some markets in my area won't have real versions of these things) so lowfat yogurt might be the best you can do. You could quit dairy completely, too. I can't remember the last time I had anything similar to yogurt.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
I can squat 180lbs, press 72.5lbs and deadlift 185lbs