Try and aim for 25-30mm total sag, with all your battle gear on first.
Generally speaking, total sag is set for about 30% of total travel, and trust me, Guzzi frequently exaggerate their suspension travel. You can very the percentage, less for racing and more for comfort.
Then measure static sag afterwards.
This number is purely for ascertaining if the spring rate is desirable for your full dress weight.
7-8mm is ideal.
0mm indicates the spring rate is too lite or too low.
10+mm would indicate the spring rate is too heavy or too high.