A Jeppesen course although excellent will not help you get a job in Luxemburg. To my knowledge, Luxair use the PPS system from Billund Flight Support and Cargolux have recently shifted from Jeppesen to become the only European user of the Sabre offering, AirPath. If I'm wrong I'm sure someone will comment, but I'm pretty sure about this as it is my job to keep a track of who is using what!
Permanant job are few and far between in the industry right now as airlines are far mroe likely to use contractors rather than employ directly as it is much easier to downsize the (sub)contracted workforce than employees if required down the road.
Stick with what you've got for now, get as much experience as you can but keep you eyes and ears open for anything moer intersting as most of the vacancies do tend to be filled by word of mouth than the traditional advertise and interview technique.
Whooaahh!!!