Freddy, welcome to the forum.
First, are the tire treads nice and round, with good tread depth, or are they beveled with a flat center?
Second, the majority of us 1100 riders go for 42F and 44-46R, depending on your riding weight.
Third, you should adjust the rear suspension. The higher the rear, the quicker and easier the steering.
When I first got my first ST, it handled really poorly for me. It resisted steering effort and fought being leaned over. Plus, the tires were very interstate-worn, very flat in the middle. But it did come with a Traxxion Dynamics built fork and a Progressive shock/spring. (Thanks, Robbie!)
As I weigh more than the previous owner, I raised the rear suspension about 1/2" on the shock body, which translates to about 3/4" at the rear axle. The steering improvement was immediately felt and was dramatic. It leaned over and came back up with gentle counter-steering.
Then I put on new tires (Bridgestone T-31s). It was so twitchy and unstable that I was sure I would have to lower the rear end back down a little. But, by the time I got home, I got used to it, and never re-adjusted it. It still responds predictably to light steering effort like a dream.