No mate I havent, didnt know there was noise filtering, where is that?
Adjusting the distance from the fly is not an easy task, I think it's about as close as I can get without touching, but I will check!

What do you think of these http://www.regal-shop.co.uk/acatalog..._Upgrades.html it's what the VXR boys upgrade to, direct replacement, 630cc @ 3bar.
I can sell my greys and buy these!