BTW, what does the pressure gauge read when the machine is idle?
A very good question.
I have set the top of my heating cycle to shut off just at 1 bar. This corresponds with a great temp for pulling shots for me, and the machine can be on for hours and is good to go. This lower pressure also decreases the steaming power, still plenty of steam for me. In fact, there is plenty of steam for me all the way down to about .5 bar. I make one or two cappuccinos a day.
It is a possibility that your steam tip holes have been bored out to a larger diameter, customized by the vendor. This will make for a faster steamer in experienced hands, but also at a loss of control, while learning. If this is the case, it would be pretty easy to swap out the steam arm for an original spec. With the original, the machine is a great steamer.
One last thought is to just open up the steam valve a little bit, and try to gain some control this way.