F3 is 800+ pounds of weight and not very aerodynamic
when compared to a Busa. However, my RT-S is fast enough to get me to sit back. but with the bikes weight, air drag and my fat a$$, I do not expect crotch rocket performance.
I am very sorry the salesman lied to you (or at the very least misrepresented). There is a youtube of an RS doing 127 mph (205 kph). I think that is like 42 mph faster than the current highest speed limit in the U.S. I dont know what range of speed you are looking for, but unless you are running tracks Spyders are more about the journey than the speed to get to the destination.
Given your comments, I do not think even mods like a super charger, increased air flow, etc. would meet what you appear to want. Were I you, I would take your Spyder and trade it in on a R1 or a Busa. Yes, you will take it in the shorts, but you will probably be much happier in the end.