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The problem is actually the arbor pin; it's too short. You need to shim the end of the pin a bit so that the barrel assembly bottoms out on the pin before the wedge slot in the pin lines up with the wedge slot in the barrel assembly. If the two wedge slots are lined up perfectly the wedge will not be effective in bearing the loads in the barrel assembly to the frame. In addition, as you have found, the barrel assembly will be too close to the cylinder.
I would suggest a bigger wedge, but that won't solve the problem of the wedge slots being aligned and the cylinder binding against the forcing cone.
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