In my own work I use PPC or Snap N Seal compression fittings
Hopefully you use the correct tool to compress them with. There are a lot of tools out there, most that I have seen used by those not in the cable industry are garbage. These are the same people who don't know how to (or have the proper tools) to prepare the cable for the connector. THAT'S why you can't trust a DIY connector.
-Hal