I ve got the same with my cyclone, I was sure the chassis was done for but I checked on my spare car whihc is a WCE and had the same distrbuation problem- Front left/ Back Right 400g and then front right/ back left 350g. TBH I did not believe that the motor corner could be so light so stripped down ect even change chasssis,shocks etc.
Its a bit of a probelm with a new 1350g weight limit in the uk, I am about 1440g if I want a balenced chassis.