I don't know about the TSC wire, but another consideration is that not all wire is created equally, even of the same gauge. I remember someone saying that wire from the hardware store was inferior. Then I ended up needing a cage NOW, and so I went to the hardware store. Whoever said that was right. The cage is an inferior cage, and I can't wait to replace the floor (16 gauge, since that was all they had). It sags badly, in spite of clipping every 2". The rest of it should be okay, but I expect my Bass cages to last a lot longer.
My original Bass floors (16 gauge) sagged badly and even broke a couple of wires, but MSD's (Bass 16 gauge) haven't. I figure they changed wire between mine and hers. I replaced the floors with Klubertanz 14 gauge, and they are way heavier and very stiff. Yes, you are right, the higher the number, the thinner the wire.
1" x 1" is really good, as it will keep out predators 1" x 2" won't. Having it in a heavier gauge will help even more.