Thank you and to those with info on the speedbox and badass box. I’ll look into those and a new sprocket.The US 9.0 apparently has 18T whereas the EU version is 20T. 18T is good for climbing but is stretching it a bit to get past 28mph. 18T equates to 45T and 20T equates to 50T.
If you dongle you might want to up the gearing to 20 or 22T. If you have steep hills beware of the climb ratio though. The EU 20T version has a 1st gear climb ratio of 1:1.09 which is isn't fabulous for really steep hills. I started to struggle at 22% grade on this bike with 20T. It all depends on how fit you are.