Well, I can confirm the following:
This login issue is not due to a DDoS, firewall, or any other network related issue. I've setup a private VPN on my OVH server and tunneled a connection while trying to login to the server.
In other words, this method allows me to bypass OVH's firewall and keeps all traffic internalized. OVH's firewall protection does not filter internal traffic. That being said, it is not a firewall issue and the server is not being DDoS'd. This also rules out the theory that the OVH protection is interpreting this massive flow of user traffic as a false positive DDoS, which is a good thing.
However, I am guessing there is SOME sort of network prioritization going on in regards to the internal traffic. I am able to get the realm selection screen ALOT more often than not now with this tunneled connection.
Figure I post this to give whatever player-side update I could for the community. Cheers