Thanks for the clarification. Given your criteria and preferences, I can see why you prefer USPCC produced decks, since Legends decks do tend towards being better for packeting, as you describe.
That still gives you a lot of options though - there's a lot of decks that are produced by USPCC with the same quality as Theory11 decks. Most Ellusionist decks produced by USPCC, for example, would have comparable quality, since they are printed in the same factory with the same standards and cardstock.
You mention that as far as Legends goes, you've only tried SOCV3s, which I assume means the School of Cardistry V3 deck? However, that deck wasn't produced by Legends Playing Card Company. The School of Cardistry
V2 deck was printed by Legends Playing Card Company in their Emerald finish, but the School of Cardistry
V3 deck was printed by a different Asian printing company. In fact, the stock used for the V3 deck is noticeably softer than the previous two versions. The publisher of the School of Cardistry decks, the New Deck Order, isn't too eager to disclose too many details behind the composition of the V3 deck, because they don't want to give away their secrets or inspire copy-cats. They want their cards to be different and to stand out from the competition, given that most other cardistry decks are typically printed with the usual printing companies, and thus feel much the same as each other.
So I do know for sure that unlike the two previous versions of this deck, the V3 deck is not the Emerald finish from Legends. One of my experienced cardist friends tells me that in his view, the finish and handling of the SOCV3 deck most closely resembles his experience with Legends' Classic finish. However it is not a Legends produced deck.
NB: For detailed info on the School of Cardistry decks, see my article here:
https://boardgamegeek.com/thread/1799795