I think there's a dead zone with UV's to be honest. I have a 4* Cold Iron with a Low UV and I'm not even charging for the UV, still can't sell it @ a normal price. To elaborate on what I mean by dead zone - people who care about UV's almost seem to prefer NO UV as opposed to a Low one, simply because that gives them a chance at a better UV when upgrading it without the choice of transferring existing UV.

In your case, someone looking for a tempered calibur more than likely will have the intention of upgrading it relatively soon. With that said.. they buy your sword then when upgrading it they face the choice.. keep Low UV or go for broke. I always go for double or nothing when it comes to Low UV's.. and you'd be surprised how many people do the same thing. I wouldn't expect much more than the value of a normal Tempered Calibur, it's sad but that's the state of the game. Nearly everyone crafts at some point = problem #1 making dedicated crafters pretty gimped. Some UV's are barely noticeable = problem #2. Considering how rare they are... they simply aren't as valuable (noticeable) as they should be on the low end.

Good luck!