I reported the same issue: Lot's of data, but too many "devices" which I could not identify after months of trying all of the suggestions offered by the good folks at Sense. So, I restarted the whole system which purged all of my data. Now, I was advised not to do this, but guess what? I am starting to match found devices with real devices in my home. Something that proved futile before.
Today, Sense has reported 13-to-14 devices. I've been able to validate ten of them. This is a huge improvement over my initial experience.
But there are some anomalies. For example, Sense tells me it found a "Dryer." Well, it's not the dryer in my laundry center. Nor is it either of the two hair dryers in the house, and it's certainly not the one toaster.
Sense also claims to have found two different heat sources, "Heat 1" and "Heat 3." Heat 1 has been off for 22h 36m. So, it's not my HVAC system. It's not the hair dryers or the toaster. And, we don't have any heat lamps, or other obvious heat sources in the home. Heat 3 has an average consumption of 0 watts, and hasn't been on either of the two days in May.
But I do have faith.....