Hi Hung,
In you wildcard VS which is the performance layer 4 VS in the Advance config have you selected "for all traffic" instead of "tcp" or "udp" I think you still have it set to TCP or UDP. change it and it should start working perfectly fine. Also for the NAT its not going to work as per your expectations as you have the wild card server. You have to have some iRules and SNAT's & VS pair created to make it work.
It is really strange but NAT the simplest thing in the network world works very differently with F5. They seriously have to look into it.
Regards,