Ozark Hen,
Just wanted to re-encourage you and let you know that you are not the only one that has yogurt that doesn't turn out perfect.
I made my 10th batch last night and like I said before, only the first 3 of my batches were perfect. My batch I made last night is still a little runny and thin and I really don't know what I am doing wrong!! But try straining your yogurt for a few hours in a collander. This really, really does help! I only had to strain yesterdays batch for about an hour and it turned out thick and beautiful!!!
Try straining it and let me know how it worked out!!
Good luck!
Donna