Its probably the same problem the late pw server had. You fill them with scripts that makes them laggy
My knowledge on servers and scripts is limited, but I am pretty sure that PW/PK scripts are far heavier and more numerous than whatever is used on the ECS servers. Some scripts to get match stats (probably fairly heavy) and then admin scripts, but that's it? In addition, tournaments in the past used simular scripts, no? I don't recall people complaining so much about lag in the past.
I think that either this serverbox is too weak or that it has not been reset for too long.
I understand that getting a new server can be tricky, but could someone perhaps try resetting the servers atleast?