Thanks so much for all the help guys, much appreciated. I think I'll take the derailleur off tonight and give it a really good cleaning with degreaser and then re-lube it. The bike is all RX100, so I think keeping the matching derailleur is ideal. Not the end of the world, though. I'll see if I can't find that spring tension setting. Also, I'll see if the derailleur hanger is bent. That would be a bummer. If I can't fix it, I think I'll go the Tiagra route with a new chain.

Thanks again. Really appreciate the help in getting this bike back on the road!

-Collin-