I use a 3 group Wega at work. When machine was initially installed (with standard 5 tip wands) we found that the pressure was creating havoc. We asked Wega distributer (CoffeeWorksExpress) to modify by welding closed the holes. We now have a 4 tip and a 3 tip wand. We use both, primarily the 4 tip when using 1 litre jugs and pumping out coffee during peak times, the 3 tip creates simply sublime microfoam and used when using the 300ml jug or when texturing soy milk. I personally prefer the 3 tip, but the other barista prefers the 4 tip. See if you can have the tips modified and your problem will be solved. Hope this helps.