The way to balance them would be to not have a guaranteed amount of spots for each region, just equal opportunity to compete for spots in the major.
Personally I think majors should be about the BEST teams competing, no matter where they are from. Not some shitters getting spots on technicality (this goes for NA too).
Ask jovik. He knows how to deal with minors
Australian teams to Open Quali CiS Minor
Dead scene, 0 team to next major
I thought about different minors