Well, I run into problem. After I form empire of scandinavia, It was created gavekin. My guess it is because kingdom of sweeden start elective on min crown autority, when you can not choise lelective yet. Some how it mean that My empire start gavekin.
So, Now I have kingdoms that elective, primogenial and gavekin empire, which is painfull. I am soo huge I do not believe I will ever be able to change succession laws in empire, as some vassals will allways figth. So, how to procide? Never think I will play empire in gavekin, and I have like 7 landed sons. Should I give up on holding good counties and try to live from taxes(never used vassals taxes yet)? Should I try to hold kingdom of sweeden title and try to make in primogenial or even gavekin too? It is currently elective. What a mess...