One question, what bandwidth do u have?
Regarding the max. no of connections, keeping that many connections with a account like dataone, will clog the bandwidth, so that most of it it used up keeping those connections alive.
I would suggest you decrease it by 70%
Listen port should never be set to 6881, because thata the default ports, & many firewalls, routers put restriction on these ports, especially 6881-6889
Even if you increase max. TCP connections, its always going to remain 10 due to restriction of the OS. You can change it however with a patch.
Sorry, dude. Just my views. No offending here.