I had a similar issue with GMod back when I first used it. Disabling the steam cloud save and reinstalling will fix the issue. It's something with the config files that are backed up that keep redownloading to the system when you delete the local files. Basically you'll need to do a clean install after disabling the cloud option. After a clean install and configuring your settings, close out and you can re-enable the steam cloud so it backs up the new data correctly.