"Then I ran across a few knowledgeable guys that told me FIT IS KING with the 9mm, "
Fit is king in every cartridge/firearm combo. Firesufficently undersized bullets and they tumble. Fire soft bullets too fast and they will strip undersize and then tumble.
Chris, I suspect if you increased the diameter of your tumble lubed bullets by 2 thou they will also shoot fine.
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