I wanted to give an update about what I decided to do with E's diaper issues. The sores on E's butt kept getting worse, so we switched back to cloth. I am SO glad we did! It's only been two days so I don't know how it's going to solve her rash problems. But the smell is amazingly better. I thought it was just a factor of my pregnancy that all of E's diapers (wet, dirty, whatever) smelled absolutely wretched. But I was totally wrong. The first morning I changed her diaper after going back to cloth it smelled like... a wet diaper. Instead of rotten meat, that is. Even her dirty diapers aren't awful, although I'm sure they will be awful to clean.
I will be trying your suggestions very soon to get the dirty diapers clean. Thanks!