I can't really remember for sure, but I *think* the bearings on Ksyrium are essentially non-adjustable, hopefully someone else knows for sure. I remember replacing bearings on them but I can't ever remember adjusting a hub.
I'm not sure if someone would have put the hub back together incorrectly or what... does it feel like there is a grinding/vibration/gritty feeling when it spins? Thats what a "too tight" hub will feel like. If its just smooth even resistance, the wheel may still have some stiff grease in it as new hubs are usually a bit overpacked and stiff from the factory.