Do a couple of searches for your model on here, there are several threads on how to deal with this.
Shortened, there is no good way to knowingly regulate the pressure on that unit as delivered, you can back it all the way down and then try to find a pressure that pours well for you, or you can get invest in a proper regulator and save a lot of headaches. Most people find the blue knob does very little for them...ymmv.
Good luck!
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