Let me introduce you to https://sense.com/ and help you create a new obsession.
P.s. it's not perfect as it uses machine learning to determine your appliances and it can't find electronics like your computer or TV but it'll help you find what might be chipping away at your power bill.
Thanks for that. I've been kinda-sorta keeping an eye out for a good solution for this. My house has three main panels (it's set up for subletting) so solutions like Sense won't work well, plus I don't want it to be dependent on a cloud service. I'll check out this product.