The correct set up is to have a cup that closely fits the hub center (the raised portion that centers the wheel), in order to keep the pressing bolt as close to centered as posssible. Place an adaptor that only contacts the center/inner race on the opposite side. #31888 I think is the adaptor number, and you should have it's raised portion away from the bearing. That way the only pressure to the bearing is carried by the inner races alone, not by the outer races or rollers. This way it's almost impossible to damage the bearing. If you're missing the instruction book I can scan and e-mail mine.
After re-reading your question I'm getting the idea that you used the large 'c' clamp looking piece to re-install the hub? If so you did do it wrong
, but hey! as long as it works, it's o.k.