I think it is very revealing that these high scores by German Tankers were very rare in Normandy. Perhaps because in Normandy it is possible to check for confirmation of any such kills?
Apart from 1 or 2 isolated examples it just did not happen in the West. Feys claims for 16 Shermans in one day is not confirmed and even Wittmann did not do as well as his Russian reputation suggested he would.