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All the same, it's a point worth thinking about if intractable vibration cannot be cured by looking for any of the other known causes.
I imagine the idea is to try and get as straight a line through the drive line as possible, with the car loaded in its most usual position.
As you say, lowing it is obvious. As there aren't any shims to start with to take out I can see no obvious way of raising the bearing. The rubber housing seats on the underside of the floor pan, so that looks like the limit other than modifying the whole assembly and finding/constructing a smaller rubber support.
I have sometimes wondered whether the rubber isn't too spongy even when new, and whether that either encourages or initiates vibration. Has anyone ever tried a harder rubber, or any other kind of modification?
After all, harder rubber suspension mountings are a common after-market modification to improve the handling of a lot of cars.