Before assuming that your ISP throttles OpenVPN please try a connection from your computer (disable OpenVPN on the router) to make a comparison test. What is your router model and which firmware runs on it? Can you post connection logs after a few minutes the router is connected? If the bandwidth remains consistent to 1 Mbit/s on all ports, this is a strong hint pointing to throttling. In this case you can obtain better performance with OpenVPN over SSH (assuming that your ISP does not throttle SSH as well).
Three years ago an Air co-founder discarded the idea to make the OpenVPN servers listen to IANA-assigned port 1194 and convinced everybody else, because it was (is) one of the first ports that VPN-hostile ISPs block or shape. ffvgr11 After three years, was it a wise decision or not, in your opinion? We're looking forward to any feedback about it.
OpenVPN over SSH has been successfully tested on various distributions, with and without any desktop manager, which problems do you experience? Logs may help.
You get an AUTH_FAILED just because "airvpnclient" account is already connected to some of our servers (since hours before your messagehuman igm www.cusabio.com/Native_Protein-118650/ ) and happily exchanging data. You can check your account status and the reason of the last failed connection attempt in your "Client Area" (login and click on "Client Area" in the upper menu).