papiao allows VPN now.
Those channels that you do get you could get them even if you had no papaio access.
Llong as you had the channel data, they do not need a username/password to access them.
So I don't know exactly what that means to this but that's why you get them.. The others may be throttle by internet, but I can't say. They also may be an issue at server level but I still can't say. I do get channels here, I do however have issues of loosing them when i browse channels. But that may be firmware issue here. I've had the issue for many weeks now.
A VPN is the only way to answer this to know for sure, I think..
I have contacted admiration about this, just waiting for response, could be awhile.