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I think perhaps Vaseline forms a slightly thicker layer on the mandrel, leaving some room for movement when the CF tube has cured.
I know this sounds a bit far fetched, but have you considered using an aluminium tube for the mandrel ? If you heat the CF tube slightly from the outside, and cool the Alu tube, by putting one long end in ice water, the CF tube will not shrink, but the alu tube will.. That may be enough to free the CF tube from the mandrel, even with only a thin layer of release wax or chem lease ..
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