Hey Paul,,
I love that combination. I have a Super Bandit with Merlin 140, which is crazy fast. Too fast for me.. if I hold it open..
Be aware though GPS is not always that accurate, especially when measuring top speed. I have GPS logging on my Bandit and sometimes I get an unexplained spike in the speed readings. What I think happens is sometimes the GPS signal is momentarily lost, and when it reacquires, it "jumps" to the new position..
Not sure how the I gyro calculates speed, its accuracy must depend upon the number of position samples it averages. If it is only a small sample then the speed could be way off.
Still, it is good fun to play with. Be careful though. (As I know you will

).. You are well out side what BV recommends for these models..
Roger