normally I used to avoid to get the unique and set items for the single time only and I supposed to do scale the same on the basis of the level which you are playing and you are not sure whether you are going to get the best version. As far as I know you will be able scale hand placed items as per the level of yours. however I am looking to have list of those stuffs so that I can avoid to get the same while playing. Also I wanted to know whether items are going to scale through the main quest or faction quest as well. Will you be able to get the best version of the items once you have hit cap of those zone where they are supposed to belong?