Just been reading this:

http://forums.tdiclub.com/showthread.php?t=262253

and it seems to suggest that manual adjustment of the actuator control rod can help cure overboosts..... I thought these were set at the factory (I just have a standard turbo on there) and were not to be touched by joe public?

I am still to source a replacement n75, and I might see if I can get a new check valve too as I read that can cause problems too if the flow is a be restricted through it.

i was wondering this myself