You gave up 15% of your salary to work in a company where, presumably, everyone earns 15% less than your previous salary. Would you accept earning swedish wages working remote from sweden in a german company?
In your book "I want to live in Sweeden. I am happy to give up 15% less. But I won't do it to somehow spite my company for paying more to its German employees."
He's be an idiot to think like that.