An update, I used bsst to check settings, all were set to very low levels of support.I have changed levels and after a short ride in my local woods the motor now runs very well, no more feeling like the brakes are on when I hit 25kph, but it’s still noisy compared to v3 versionI’m passing the bike onto my son - after I have done some tweaks with bsst tool, I’ll get him to feed back about any changes about noise