Glad you figured it out. Three humps is crazy and certainly indicates a manufacturing issue. I've had good luck with Sunrace customer service, so even if your hub is out of warranty you should send them an email. Contact info is below. The person I dealt with was David Prosser.
Good luck.
Info@sunraceusa.comSunrace Sturmey-Archer952 School Street
#409 , Napa CA. 94559 USA
www.sunrace.com www.sturmey-archer.comTel: +1 (707)259-6700 E-mail:
david@sunraceusa.com