You could be a genius Dutchy! I couldn't budge the clamp easily, however in my effort I managed to bend the screw shaft a little, not ideal but it worked. A bit of tape on the thread confirms its not impacting the actuator. It now feels a bit more controlled in the boost...its seems that the max boost is a lot more limited (ie its staying at max less often)...there is less traction loss on the same crap tyres in 2nd, with no loss in 3rd so its definitely had an effect - which I'm pleased at.
I'm getting the Potenzas on tomorrow, I expect that to make a further transformation in the grip.