Actually I can't download a single RAW-file in full resolution directly back to my desktop. I'm only able to export JPEG in full-res or RAW+Settings only in 1920x1280. I wan't permanent access on all my original raw files, not only over the lightroom downloader for my whole cloud.
How do you check the size of the exported raw file? Raw is raw, so there is no way that Lightroom CC can export a raw file at a different size, even if you wanted it. There are some cameras that embed a small preview in their raw files, so I wonder if you perhaps are looking at the size of that preview rather than the real size of the raw file itself.