The Mustang is a nice saddle, ran one of a couple of years before moving to an Ultimate. It will drop you a little deeper in the saddle and set you back somewhat as well. The stock link will bring your ride height back up. Past that check the shock adjustment under the right side panel and ensure it is in the middle of the range. Most come from the factory in the softest setting.
As many have suggested in other posts, get your seat right before moving on to the windshield. I started by replacing the stock with a Baggershield. After purchasing the Mustang seat I moved to the 14" Klockwerks Flare which was perfect. Now that I have the Ultimate, I will likely move to the 16" Flare since the new seat set me up a little higher.
Glad you are enjoying your new ride. It only gets better as you spend additional time in the saddle and continue to learn every nuance.