Polish routes also very very good loads, but yields were 100% trashed this winter.
What are you basing that comment on?
Same pax as EZY on double the flights, sometimes with a larger aircraft.
Presumably you're referring to SXF? Same country, but not necessarily the same market - might be the same number of pax with more flights, but how much are they paying (have a look at the prices)?
I've certainly seen adverts for EWG, but I think nowadays people are more informed/swayed by sites like Skyscanner, Expedia, etc
Availability of suitable slots is normally mentioned in relation to FRA