Well this is my first sour, so that's good to know. However, when I racked into the secondary I ended up with about 5 inches of headspace and I still have a couple inches of white glop on the bottom. Do you think I should rerack and add fruit, or would that be too much oxygen?
I rack my sours once at most, sometimes not at all. One of the main reasons you rack regular ales is to prevent autolysis (sp?) of the yeast, but that's not an issue with sours. When the bugs eat the dead yeast it doesn't add those meaty autolysis flavors, it just adds more sourness (or brett character, etc). Too much oxygen, on the other hand, can give you too much acetic acid, vinegar character.
I only have a few years experience brewing with bugs though, so I welcome other opinions or corrections.