Has anyone tried these SnugPlugs?

Sounds like another 1/2 way gimmick, God knows audio has enough of them. Take the hospital grade advice.. will still give you full contact, +solving the jiggle problem. Don’t worry about any of the burn in BS or high dollar supposedly audio specific outlets, do worry about diminishing returns.

Interesting idea, but my guess is that for most "loose" outlets, the Snug Plug would make it difficult to fit an audiophile plug once they were inserted into the outlet.

That being said, I wish I would have thought of it. 

If you notice, there’s Vaseline in the outlet to ‘demonstrate’ the loose plug. 99.9% of outlets don’t loose the plug to that extreme. If it does, replace it. Use a hospital grade outlet and save your $$ on the audiophile type.

Looks okay for an inexpensive fix, but I rather replace the outlet

+++++++1 to just replace the receptacle. You will get a vice grip type connection, and superior audio performance. I've tried well over a dozen receptacles, and all improved the sound over a stock socket. Look around for prices, they can vary by as much as $50 per unit

I use (and can highly recommend): Furutech GTX-D(G or gold) $165, Furutech GTX-D(R or Rhodium) $180, Oyaide R1 (Not SWX series) $160, and for the more affordable range Acme Audio Labs (Silver, cryo'd, CFC coated) $75