since it has been a while, this trick works on the twins as well. The other improvement you can do is to install viper/srx reeds into your tripple case. They have alot more surface area and the reed stopper is mounted back further away from the port to start with so the notch is more affective. To do this you will need to do some grinding on the sides of the case. You can add the viper/srx reeds to the twin cylinder sleds without modifying anything, they drop right in and by themselves help to unblock the boost port even without the notch.
While your in there, dont forget to smooth everything from your carbs to your boots to your stuffers