It's 1594 now and I'm trying for the achievement to unite HRE with specifically Spain (should have done that earlier). Anyway Austria in my game is my sole ally and just lost its title in HRE to Brandenburg (but they will get its back in no time, Brandenburg's king is 64). I now intend to vassalize 4 electors including Brandenburg before Austria take back the emperorship. The problem is that no reform has been passed and the fact that you lose IA for each subject elector means both me and Austria will have a very hard time gaining IA. The only way I see in this situation is: add provinces, lose emperorship, take out provinces, get emperorship back and add provinces again. Should I then attack HRE or should I wait till HRE pass some reforms? I think the latter is more reliable if I want to achievement but electors can grow too big in the mean time. And if I want to focus on Europe now I will have to move my army back form America where westernization is spreading like disease.