As Jon said, suspension is a very personal thing, some like it soft some like it firm, others like to bimble along others like to give it the beans e.t.c.
But remember !!! Moto Guzzi have spent a lot of money on suspension set up, it stands to reason that they want the best handling bike possible with the suspension system they are using, so stock settings are not going to be a million miles away, even though they will have been set up for a 12st rider.
Unless you are over 15st, carrying a heavy load, or ride like Rossi on very good tarmac, it’s not going to be of any benefit to alter the fork settings and if you do this should be done in very small doses.
The weight of a wet NTX and a 12st rider is 828lb. The maximum carrying load of said bike is 1091lb so that gives us 263lb to play with between the lightest and heaviest load suspension settings.
Don’t forget it is very important to balance preload and rebound settings. Rebound can be a pain as the adjusting screw is obscured by the suspension link. But, if you put the bike on it’s SIDE stand take a good fastening strap thread it under the torque arm then through the passenger grab rail and pull it tight it gives plenty of room to get to the adjuster. BE CAREFUL NOT TO PULL THE BIKE OVER ON YOURSELF.
A good rule of thumb is to allow 1 stone per click on preload and 1 click per 2.5 stone on rebound.
e.g. If you are a 15st rider then start with 15 clicks preload for the average 12st rider and add 3 clicks for your weight.
For the rebound start with the 24 clicks from fully tight and add 1 click for you weight.
For me this system works and you’re never a million miles away from how the suspension should work, naturally you would adjust it slightly each way depending on your preference to soft or firm ride.
If you do like the front a bit firmer you can adjust the spring preload, but just bits at a time and not more than one full turn.
Unless you are a riding god and can tell which side a coin is on when you ride over it leave the rebound and compression alone.
All of the above is of course my own opinion. And it’s nice to have a play sometimes, and if you totally cock it up, just go back to stock and start again.