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Bypass it first, it will increase your fuel rate.

Am I to assume this was all done on a level highway? Try it again, going up a hill. The TM tells you how to "field set" the max fuel rate, using a boost gauge. 15 psi max will keep you safe under almost all conditions. Your testing only tests in one condition. Apply a load and you'll be...

15 or more is going to make way too much heat(EGT).

Adjust the theaded stop rod on the left side of the picture. It looks to have jamb nuts. I can't open that picture to see any real detail. I would not make any adjustment without a pyrometer installed. A boost gauge can be used but is much less absolute(indication of temp). Stay under 14...

Do you have a G code IP? Here's a pic of it inside. You'll need to remove the cover and adjust it.

Your increasing the servo pressure spring. Adjusting the servo pressure can be done externally also. It is not doing the exact same thing that adjusting the max fuel rate does. It will increase power, EGTs and boost(not as controlled) With no FDC, it can't be done. The servo pressure...

Or, if you tow a load or drive up a long grade. You'd be suprised how much higher your EGTs will get.

Just remember, adjusting the max fuel rate without monitoring your egt's, is flirting with disaster. Unless you read the dozens and dozens of threads on this topic and or understand what your doing and monitor your egt, don't do it! That screw is NOT a horsepower output dial.