Funny you should mention shortening the screen, I came across this last night.....

http://www.ebay.co.uk/itm/162676976989

When I bought the bike it came with a tall screen but it had one of the bottom corners broken off so I never rode with it however it's a perfect candidate for cutting.
I was going to throw it on and see if it makes any difference with the added height. I've no idea of the make though.

Cheers jacques, I'll keep that in mind, but I wouldn't know what to offer you