You seem to be doing a lot right with this, including drinking the wine!
There will be some of the other regulars with a lot more lighting experience that I have who will comment also, so I will give some feedback on what I see, and what you have described.
You are using two flashes, with the one on the camera right set to higher power than the one on the left. With the objects so close together, I wonder if the brighter flash isnt also affecting the pewter jug? Perhaps try a sinle flash with the jug alone, and get it lit without reflections..
There appears from the image, to be not quite the diffusion of light I would have expected inside a light tent. Have you tried also adding a diffuser to the flashes, like tissue paper, etc. or dome diffusion paper on the sides of the tent where the light enters?
The black(?) background is also illuminated quite a bit, not being actually black, suggesting that light is not contained well, or that the background is very close to the lit areas, or its not non reflective material.
If you want to look at post processing to improve the image, I would start with making that background entirely black. I did this in the mod by clicking the back curves dropper (or levels) close to the pewter jug, on an area that appeared to be lightest. You can identify the lightest area using a threshold layer, or holding down ALT when you click the black dropper.
The hot spots on the jug, are a little blown, and they look better toned down, or covered over with some low opacity cloning, but overall, the jug looks quite good.
Done in the mod, and its also rotated a little to level.