Thanks for the continued help Brent!
I have @2x support in my config.lua file:
imageSuffix = { ["@2x"] = 2, }
The smaller resolution images are 32x32 and the larger are 64x64. There’s only 4 textures being loaded during just the main game mode
Edit: To answer your question more directly, the full resolution graphics are being used on my tablet, and the half-resolution are being used on the simulator and phone.