Alright, already done that, but if you look here:
https://www.privateinternetaccess.com/helpdesk/kb/articles/can-i-use-port-forwarding-without-using-the-pia-client
It seems that something needs to be done in the openvpn for this to work?
EDIT:
Just read it, and i can see what you mean:
So it should be working....