I would suggest woosner yep. Try:
http://www.gmcmotorsport.co.uk/engin.../prod_279.html
If you think 10psi is more than a lot of standard cars run as max boost (11psi on a Seat Cupra R, 8psi on a Volvo T5R etc). Half a bar would be generally considered low boost - 6-8psi.
On the motorway you're fine if it's a few psi all the time, thats unavoidable - what I interpreted from your post was that you were sitting at 120mph the whole time running 10psi. You'll chow down turbos like that quicksmart