Limp...finger?

First topic message reminder :

My 45 has recently been doubling. The manufacturer, highly respected and a bullseye shooter, was very concerned. I sent him the gun and he thoroughly checked the sear, sear spring, disconnector, hammer and more but all were good and he couldn't replicate the issue. He did say there was too much overtravel in the trigger and that could sometimes cause doubling. I got the gun back and it's still happening. He suggested having another shooter fire the gun. I couldn't believe it, no doubling.

I texted him from the range (about 8:30pm) and he called right back. He said he didn't want to say it because customers might think he was making excuses for his work but it's not uncommon for shooters, even shooters with some experience, to relax too much on the trigger.

He suggested a drill; fire a round but focus on keeping the trigger all the way back for a few seconds. Recover and feel the reset and hold it there for a few seconds. Then fire another round. It was getting late but I put about 30 more rounds through and, lo & behold, no doubling (ok, once but at least I felt the trigger).

Has anybody else experienced this? I never really feel my reset while shooting. What's proper reset technique?

Any thoughts or suggestions would be appreciated.

I've had a gun double a few times, and my recollection is that it happened so fast I wasn't sure if it was 1 shot or 2, it just felt and sounded different.  I knew it was a double by counting the rounds left in the mag. If you're experiencing 2 distinct shots, it could very well be you're bumping the trigger a 2nd time.