Oke, I feel like a complete Ass.
It appears that 1 of my cables was broken (not visible, and it was a tested cable, but somehow it got broken)
So here`s what I did, for the people who find this threath looking for solutions for the new bravia series:
I started over again: I resetted my tv and my router (enable UnPn again!), and reïnstalled PMS again, with the settings from the link I posted in the 1st post (for Dutch subtitles). I deleted all the render config files, and replaced them with the one MattofSweden created: http://ps3mediaserver.org/forum/viewtopic.php?f=15&t=2099&p=29955#p29955
I added |(BRAVIA KDL.40ex40b (and some extra +40, +ex and +b`s to make sure
) to the 8th line. And now it workes, complete with Dutch subtitles.
I`m sure it`s not the perfect setup, but after many many hours of trying, i`ve desided to leave it this way for now
Iff anybody knows how to improve something in my setting, feel free to shout.