I cannot say for sure what your issue is, but when I got the black one, switch was overly stiff, and would not fire reliable. Looked through my spare springs for a replacement. During the process one of the springs caused it to fire when turning the end cap on all the way. That would be the first thing I would check. I would/did also replace the o-ring on the contacts with a decent quality one.
2 of my 3 are 1:1, the third has a shorter blunt pin to activate the clutch, all three work equally well once I did a little work on them. I polished pin/clutch surfaces as well as the key contact points.
If you can post up some pics of the switch and clutch type contacts it might also prove useful. When working properly the switch is quite nice. I bought a set of SOI silver plated contacts which work equally as well in all three.