Drag limited body design is not 150, it is around 135-140 MPH...the theoretical top speed is around 150MPH.

I can imagine speedometer error as why it was climbing at 137 (do you have stock tires on? Hondas read 2% high), published top speed are usually between 128-132 MPH. I took several trips to 135 when I had my AV6 along the Finger Lakes on Dunlop SP9000s and the car felt like damn stable up there, but traffic always prevented me from digging it out.