No, there's no "right level of balance" when it comes to that. It's been less than a decade ago that they were called the "sick man of Europe"; and thanks to some very creative interest-rate games at the ECB (which is in Frankfurt), they magically recovered. You don't turn things around that rapidly without playing some kind of shenanigans.
They have found the right level of balance between social services and economic growth
Hold on there. Germany has a social market economy, which stipulates government intervention in putatively private business. There are plenty of other countries around, even within the EU, with more attractive tax regimes; if they don't move there, than that's all due to government interference in Berlin. Also note that those countries within the EU with lower corporate tax regimes are being pressured (mostly by Berlin) to raise those tax levels. Doesn't sound like Berlin wants competition, does it?
German tax laws encourage businesses to keep as much of their operations on German soil as possible. Why do you think German automakers still have most of their assembly lines in Germany?
. . . and they're the only people who are so willing? The "austerity measures" that are being imposed on the rest of the eurozone are projected to cause a lot of job losses—except in Germany. I'd say that the much-vilified Greeks would work just as hard as the Germans if they could, even if they had their accustomed government benefits cut by several degrees. That would be more than enough to get them to reject the communists' influence.
Germans are willing to work hard to economically advance
Yeah! All summer long, while the Greek government was cutting vacations and raising the retirement age from 55 to 60, the Greeks were rioting to go back to work!
Meanwhile back in Deutschland, the Germans were working for pensions that start at 65-70 so their Greek brothers could maintain their cushy life style!
Typical Olog-hai logic.