ALL carbon fibre relies on the shear and compressive strength of the epoxy that's just how it works.Yup the braid is doing its job holding the shape, possibly you should really have made a small inner sleeve to hold the shape and locate the join. Heat shrink tape works quite well and the heat sets off the epoxy. Carbon should be tapered at 100:1 if you want to do it precisely, 200:1 if you simply want to layup over the top as effectively you have done relying on the Epoxy glues strength.
From a more practical level, what you have done " works " and not all carbon repairs perhaps need to be "signed off" as the work I have done on aircraft needed. The art of a true master in carbon repairs though is when after the repair, the repaired piece weighs the same as it was before needing a repair.
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The gap between the original tube ends was only around 0.5mm at most so I don't think that there was much danger of it losing it's shape.
I agree that this would not be acceptable in an aerospace "repair" but this was a non-aero modification so I was quite happy to add both bulk and weight (though it is probably only around 50g).
