Bookmarking this.
There's one problem I haven't solved yet, regarding reinstalling things. Like you said, I want to keep the number of sets/items to a minimum by not installing duplicates. But a good part of my purchase history is individual items (hundreds if not more). For furniture, I can sort of tell what set they belong to, although when it gets to the plethora of lights and small decor items it's a bit harder. Clothes, though, I have a hard time telling.
I'm not sure how to check, in a time-efficient manner, what sets certain individual items belong to. Looking them up individually in the Store is obviously one way, but I just don't have the time for it at the moment.
