Hi,
This is an old post but for other users in the same situation, I just wanted to say that you may try our rigproxy.com service
(keep your VPN and connect to rigproxy as a pool).
If you have a high VPN latency, I would suggest dwarf port instead of ethermine or nanopool. Dwarfpool is more tolerant with "stale share".
Ethermine shows almost no tolerance, nanopool is between both of them.
(Based on our share transmit latency tests).
Happy mining.