Did you use spades with your Furutech outlets?

[Speedskater]

The above dual receptacle has high-tech back-stab connections (very different from low-tech, low budget, spring-loaded back-stab connections). These high-tech back-stab connections would be my first choice. It's hard to get them wrong. Connections wrapping the wire around the screw or crimp-on lugs can and do go wrong.

[Speedskater]

13 hours ago, davide256 said:

Stab connectors are a bad idea...the connection point is narrow causing  higher failure rate over time from oxidization and conduction thermal heat.

Yes, back-stab connectors on bottom shelf receptacles are bad news.  But while the back holes in the above receptacles appear to be back-stabs, they are not.  They are alignment holes for the side-mount screw connectors.  Several good manufactures make this style top shelf receptacle. This style is my first choice.