Propane Regulator Adjustment. I have a Marshall Gas Controls propane regulator Model 230 installed

Question

I have a Marshall Gas Controls propane regulator Model 230 installed on a sailboat and I need to increase the discharge pressure of the regulator because of the relatively long run to the stove. Unfortunately the regulator was installed in such a way that I can't remove it without a significant amount of effort. So I would like to find a way to increase the discharge pressure while leaving it in place. I removed the cover plate and saw that there was a hex shaped opening that fits an Allen Wrench, but I was reluctant to adjust it for fear of damaging the regulator. If the regulator can be adjusted to increase the discharge pressure, I would appreciate instructions on how to do this. Thanks in advance for your help Pat