I'm on PC, and have already reduced my own carry weight to make it more realistic. Now I have a companion (ED-E), however, this realism is negated by their carryweight still being about 210.

Does anyone know if there's a console command to reduce this?

I've tried selecting the companion and typing "carryweight x" but that doesn't work. I didn't find anything on the wiki.

Maybe you could use the Geck? I have no experience with creating mods, but it could be a possibility.