A bench tech in Reno pinched my crimp job and now I redo every RJ45 twice

I do on-site work around Carson City and I always figured my cable crimps were fine since the link lights came on. About two months ago I hand a run over to a bench tech in Reno who was helping on a small office job and he pinched the connector with his fingernails and gave it a little twist. He said if the jacket moves even a hair inside the plug, the strain relief is doing nothing and that run will fail in a year when someone yanks a chair over it. I checked and he was right, my jacket was stopping about a quarter inch short of the crimp on almost every end I had made that day. He showed me to push the jacket in until I could see it past the crimp bar, then squeeze, and to give the finished plug the twist test before it leaves my hand. Now I cut a couple extra inches of slack so I can afford to redo an end, and yeah I have been tossing maybe 2 out of every 10 plugs in the strip bin. Took me a week of slower terminations to break the habit. Anyone else get taught something in 5 minutes that undid years of the way you do it?