@mikertroid
not specific to Superstar, but my experience of pedals using a bushing in the design is that often the bushing ‘socket’ in the pedal body becomes enlarged (flogged out) due to a worn bushing
replacement of the bushing does not cure the issue, as you get small movement between bushing/axle and pedal body under power
I’ve had this happen with 4 pairs of Wellgo MG1 (was getting them really cheap) as well as DMR V-12 Mag, and only solution was to replace the pedals- the Magnesium pedals seemed to be very prone to this due to the softer material, I’ve had this happen on some aluminium Atomlabs and the distributor replaced them FOC.