When I did this from my house, it was about a 3 month period before I actually got anywhere. There's a ton to think about, like the OS, Apache, MySQL, PHP, Admin software, DNS providers, dynamic IPs... Not to mention the lack of tech support .
Also, I just looked at my MySQL info, and my username also has a prefix. When I made the user, his name was "andy", but it also has my cPanel username as a prefix. My ACTUAL MySQL user is *username*_andy, just like my database is *username*_arcanesystems. If Vdeck is adding a prefix to your user also, you could be running in circles without even knowing it.