I finally admitted I was over-tightening every single tool holder for years.
A guy I trained, fresh out of the program, was running a job on our old Haas. He stopped and asked me to check his setup because he thought his finish looked off. I went over, gave the collet nut my usual 'good and tight' crank, and he just looked at me and said, 'My instructor told us that torque wrench in the cabinet isn't just for show.' I had literally never used it, thought it was for the big stuff only. Grabbed it, set it to the spec printed right on the side of the holder... it clicked way sooner than I expected. I'd been cranking them down at least twice as tight as needed. No wonder I went through so many collets and had that one spindle issue. How many of you actually use a torque wrench on your tool holders, or is it just a feel thing?