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1. The option of clearing out the extra zones is interesting. Yes, perhaps that would be better. Although, making them bonus zones, considering the much more powerful guards, is also a viable option, in my opinion.
2. 4 teleports? Well, I'll have to test it out. It might end up being similar to castles – when you place 4 of them in the center, the paths often get disrupted, and you end up with 2 sub-centers in the middle.
For fans of 8mm6a, I've created a mirrored version of 8mm6a!
The template was taken, divided in half, and the left side was mirrored. Paths to the opponent are through the same zones 19 and 12. The cross-shaped portals work.
Mirrored 8mm6a with balanced mines
Mirrored 8mm6a