OMG, I have been looking for ages to find something that brings the outlets forward from the box. I have a bunch of add on outlets and poor do-it-yourself construction in this house that we recently purchased. Often times the metal plates don’t do the trick because the drywall doesn’t fit close enough to the outlet box.
What I have been using to bring the outlet itself forward and fit flush with the outlet cover are the clear plastic mirror holders that used to be used in the 1970’s to hold unframed mirrors. They don’t conduct any electric charge, but come in varying thickness.
But these spaces your have identified are the bomb! I order a pack and will start fixing all my funky outlets.
My power cables were really sagging in the outlets so I bit the bullet and bought the Shunyata cable cradles. Yep, pricey, but I could not find anything that worked. At least THAT problem is solved.
Thanks Erik