The 'Rule of Thumb' is that 20mm change in suspension will change the head tube angle by 1 degree.
With that, you can effectively adjust the head tube angle on your bike by 3.5 to 4 degrees depending on your travel setting.
You might be on a trail that has a majority of smooth curving turns where you can crank up your speed and fly. You might want a slacker head tube angle to slow down the steering and make the bike more stable at speed.
Or, you might have a super technical tight twisting singletrack through closely spaced trees where your top speed is slower, but handling is critical. Crank the travel down and the bike will improve in it's handling.
On the descents, you'd adjust it all the way out to 130 to give you the full amount of travel, and slow down the steering to it's extreme.
etc.
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