I used the -datdir=<path> at the end of bitcoin-qt.exe shortcut and also input that path in the Armory settings under "bitcoin home dir". It is downloading for sure, but I don't see the new data path filling up at all. I installed the core in the default path, so I let Armory find that, but changed the home dir setting. Been downloading for a little bit but can't find where it is going right now. I figured my optional "-datdir=<path>" would start to fill up but it is not.
It hands it over to bitcoin core once it's downloaded the block data, bitcoin core indexes and verifies it (also takes time). Once that part is done, you will find that data in the directory you're expecting it to be in.