Hey tesox,
I donīt really understand your problem:
Once you decide to live in another country you should be willing to adapt to its society. I think itīs strange to expect a life you were used to live in you homecountry when being abroad. So why is it impossible for your children to join the regular school system in Germany? The standard is very high - and itīs free! Children usually have a lot less trouble in getting used to new circumstances and for me personally it is a must to learn the language that is spoken in the country I live in.
Regarding the salary: The controllers union is pretty strong over here. How could the DFS ever justify that you needed more money than the other controllers?
On the other side I have to agree that working for the DFS is kind of frustrating. Workload is really high and instead of receiving some appreciation they tell you that you are not worth the money you get for what you do.
Best Regards...