I went back to placing shrink tube over the hot pin and a 1/4" or so of the hot wire.

I also revisited the crimp and solder, magnifying the pic Jeff Day took for his review.

As you can see, especially if you enlarge with MS My Pictures, one barrel crimp is pressed down and then the neutral is sandwiched between it and the other. This may be a better method of making a good mechanical connection while still protecting the hot wire from the iron heat.

I'm kinda obssessing because my previous fave connectors were vampire 800C, $27/pr and Eichmann at $44/ set of 4. The Switchcraft have gone up, BTW, ten piecees will now set you back $18.80.