Let me know when you measure that with an actual GPS. I ran my XO-1 with TSM and I capped out at 90 MPH also but I was fighting with wind. I am wondering if TSM caps it out at 90 mph depending on the setting - this would be very interesting. Did you run out of road or were you at full throttle for a good amount of time?
Here is mine running 90 MPH with TSM installed:
going to get gps this weekend. will go with 34/46 gearing before i go xl2 and new motor.