So basically what you are saying is that the wraiths tend to uncloak when they are given away. This is probably due to many different reasons that would require your map to be posted.
In any case, it should be fine if the units are given to a human player. If given to a computer player, the unit's hp makes the difference. Higher hp tends to react differently compared to lower hp.
Id have to see the map.
Oh yea, and chii owns. Yea.
