Yogurt

I consume an inordinate amount of yogurt. Maybe not as much as some people, but I have a cup of yogurt every single day and get really bent out of sorts when I run out. This has been going on for about a year now, around the time I found out I was pregnant I think it started. In fact, I was consuming so much yogurt that--thanks to my husband--I quickly switched to making my own. I don't do flavored yogurt, like that nasty stuff that comes in land-fill bound little cups and promises flavors such as "Strawberry Shortcake!" or "Chocolate Cheesecake". Gag. I like plain, low-fat organic yogurt. I mix walnuts and flax meal in for an Omega3 boost and sometimes I'll add dates or bananas. I could go on and on about how much I love yogurt and the health benefits of it (packed for of protein! great for your stomach!). But what gets me today is that I just sat down to another batch of yogurt that was less than perfect. How did this happen... again??? After about a year of making yogurt, something has changed. The last few attempts I've made to re-culture my yogurt have resulted in a thin yogurt, not what I'm shooting for at all. I like a thicker, firmer yogurt (Greek yogurt is an indulgence). So what am I doing wrong? What did I change in my method? The milk wasn't too hot, so I didn't kill my culture, I tried "tempering" it so that it would be distributed evenly... I even let it 'cook' for an extra hour. I can't figure it out. This has only happened when I tried to re-culture, so its gotta be something with that. Could it be because after the incubation time I let it sit out for a few hours? The incubation time ended at 3am and I forgot to get up and move it to the frig until about 6am. I don't know, but I'm disappointed. Meanwhile I am eating thin yogurt and using all of my husband's precious milk trying to figure this out.... ~sigh~