An IEC with grip

Or there is the old jury rig - tape wrapped around the cable in cradle fashion with the loose ends attached to the top of the component thus holding up the plug and preventing sagging. The only drawback is having to loosen the tape sling when the component needs to be unplugged.

I always use this technique on I2S plugs most of which have very inadequate bearing shoulders.

I am a little confused, and maybe it is just me. I have never had the male side of a power cord pull out, but have on several occasions had the female (component) side of a power cord come loose… particularly with upgraded PC with harder / larger plugs. I am never able to feel like they are fully seated. Is there a trick I am missing?

I've tried Teflon tape and if it migrates, You have to be careful as it conducts electricity and you'll hear a crackle. I stopped using it. I've stacked things to prop up the connector but will try those inserts. 

The grippiest C13/15A IEC I’ve experienced is from IEGo. Comes in a bunch of different flavors ranging from bare copper to gold-plated copper to rhodium-plated silver. They also happen to be a pretty good product for the money, so perhaps that’s your ticket.

Totally feel you on this one. I have been very disappointed in many of the higher end power cables from Shunyata, Wireworld, and Synergistic. They do not trip well at all. In many cases I have had to place an object or 2 under the connection to the component so they stay in place and connected.

I highly recommend DH Labs. Specifically the Power Plus Cryo and Red Wave. These cables have a super tight and secure grip. The best I have experienced. Plus they’re amazing cables. I replaced a Shunyata Delta on my Processor with the Power Plus and what a difference! Solid connections!