I would urge you to put any substantive changes you make onto the Test Center for a bit, at least in some form. Not just like bug fixes, but substantive changes, so that way it can be seen what'll happen in actual fact. And not just Origin, I mean, though it should stay there for awhile too, but I mean to leave substantive changes on the actual Test Center for a good bit.
It also occurs to me that the Minax artifact turn-in value may be too high. You may not realize just how easy those can be to farm for some. (Not for me unfortunately, as I rarely make it to the mages in time. But for others.) I forget what their turn-in value is, and the main UO.com site isn't working for me at the moment, but as I recall it was pretty high. (Also of course the Minax artifacts already have a purpose, whereas the turn-ins perhaps should be about things that don't have a purpose, or don't have much of one, at the moment.)
-Galen's player