Fifa 10 Ps3 Online Problem

Ok this is quite a common problem, I've found plenty of tips online, but somehow I can't solve it.

When I try to play FIFA online with my ps3, there are communication problems with the other user I'd say 80 percent of the times. It's an issue of port forwarding, I pored over every single advice I could find, I forwarded the ports that should be forwarded, but to no avail.

I have a True 4mb connection, and a Zyxel 660 router.

Did you have similar problems? Can you fix them easily? or is it simply a True problem and will never be solved completely? And if they're solved, do you want to play online against me? :-)

thanks for your help