Thank you again. You pretty much confirmed my suspicions but it was still very helpful.
I actually have a bit more headroom in the game than I expected; it's using 1.72GB. Not great if it maxes out at 2GB, but not awful. I'm not adding anymore worlds or SC at all right now.
In all honesty, I probably just need to figure out how to get it to run as well as it will on the Mac for the time being. I don't have the terrible issues some Mac users have had; beyond this problem the game honestly runs pretty smoothly. I get an exception raised error maybe once a month or two when the game has been running for, you know, fifteen hours straight.
I don't want you to feel like your advice just went in one ear and out the other, though. I'm just due for a new computer probably by year's end and it's not going to be a Mac, so I just have to decide whether I want to go through the trouble yet, especially since I can't just install it in Windows without serious cleaning or redoing the partition entirely. I don't even have that much extra room on the Mac side at this point!
I would/will do it if and when the bugs become unbearable, but this post was more about trying to head that off for as long as possible, realizing it may not be that long. Sounds like the best way to head off the problem is to stop adding store content for now-- and I'm pretty well saturated-- and following the links to try to remove what CC I can remove. Thankfully there is really not much unofficial CC in my game.
On a related note, will it be easy enough to switch over my games (I.e. re-download/re-install) on a PC after them being on a Mac? I kept using discs for a REALLY long time and I still have all of them and the serial codes, but I did finally switch over to Origin/downloaded files about a year ago and certainly the easiest thing whenever I switch to PC will be to just re-download if I can...
So... yeah. This was extraordinarily helpful and illuminating and I guarantee none of the answers I found on this situation addressed it as thoroughly as you have, so I really appreciate it. I'm still going to do some thinking about the best plan of action. Right now it is totally relegated to the one tab of the launcher, and the times I get an exception raised *in game* are as infrequent as they've ever been. Obviously if it starts getting more frequent, I'll have to think a little harder about what to do. But I'm also going to stop getting store stuff until I DO get the game up on a PC, whenever that is.
Ironically, because my Mac is pretty powerful, I have WAAAAYYYYYY fewer problems with my game than my partner who runs it on a PC with fewer EPs/SPs and a lot less store content than I have. But I do realize that doesn't really mean much, and my computer has better specs. Just kind of funny because I know Mac-based TS3 players have had a real time of it, in general.