As for the minimum wattage that each appliance uses, I’m curious where you set the limit for electronic units that have a low power “idle” mode, like my washing machine. When in true standby (what most people call “off”) it draws no detectable power (literally 0 according to the HEM). When in “idle” it draws 14 watts, and when running it draws hundreds and into the thousands of watts.
Is your 21 watts for the washer intended to ensure it is actively running a load? If so, did you bother to try for any granular alerts, for example: