A quick update for anyone interested in this little mod. I did it 3 weeks ago and it really has noticeably improved driveability and pickup in all conditions - urban / town driving and open-road / motorway.
I measured the factory-fitted hose that I removed from mine and it is 15.6cm in length, which was just a bit too short to connect the vacuum solenoid to the actuator without a sharp curve.
I firmly believe that when vacuum is switched to the hose (which only happens when you touch the throttle), the sharp curve in the hose was sometimes being tightened by the sucking action, restricting the vacuum seen at the actuator.
My replacement silicon hose (6mm ID, 11mm OD) is 20cm long, making a nice smooth curve.
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