Matt, the automatic adjuster is only going to over-ride any manual adjustments you make. Make sure everything inside is assembled properly, clean, and that nothing is stuck.
If this is the first time you've done this, take pictures before and during dissassembly in case things don't look right when you put it back together. I jacked up the entire back end, removed both drums but left one side intact as a reference to reassemble the new side. It's not that difficult, but it's a good idea to take precautions in case you have a brain fart.