I have had the problem of the tubing slipping in the bar clamp before, too. A trick you can do is to scotch-tape a single layer of sand cloth to the od of your tubing with the sandy side towards the tubing. Then install your bar clamp and dare it to slip again!
I always have to do 3/8" tubing that way. My tool does 5/16" for the most part without slipping.
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