Thanks for your reply. The Forum admin asked me to repost the question with more details.... meanwhile I did get the 1 to 1 working, now trying the 1 server many clients (
https://forums.openvpn.net/topic8149.html)
I only resorted to trying the client to client to see if there were router forwarding or firewall problems, as I mentioned it worked so back to server to many..... really struggling with it.