Sorry, but I don’t feel able to answer your queries 
In the image I posted above, “charger” and “dining_table” were using TP-Link Kasa plugs (which report Amps rather than milliAmps). Since then I have rearranged where each plug is used, and separated fridge/freezers and washer/drier onto separate lovelace cards to make the comparisons more consistent.
I have also found that my wi-fi AP only allows 15 devices connected, so some have been dropping off from time to time.
Moreover I found that my PC191HA switches are always showing Voltage, but only sometimes show non-zero values for Current and Amps; as described in this post.
I am currently waiting for a drayTek AP802 (32 wifi connections per band); and intend to do more thorough testing once all has settled down. Renaming devices has of course also played havoc with HA history, and I’m wondering if it’s a good time to start from scratch again on a new SD card.