Getting an outlet to grip better..

Try prying the flanges of the plug outward (there should be some give). Do it just enough for a secure grip when plugged in -don't go crazy.

I believe the "Maestro outlet" like any other product could have an occasional defect. A few years ago when I was reading all the hype on Audiogon I purchased a new Maestro outlet and installed it in my dedicated music room. After about six ins and outs of various AC power cords, I was auditioning the outlet came appart, as I recall the back strap let go and the outlet was worthless. I've never had that happen to an outlet before and I've auditioned at least a dozen high end outlets.

One reason to use contact enhancement silver paste on wall outlets is too create a better physical and electrical contact, both in terms of surface area contact and conductivity. Hel-loo!