Wait to see if it works first... 😄
I did test it a bit and it seems the respawn is well under control. Some might even feel like the nerfing is too much but for my own personal taste I think it works fine this way.
Sure, that's just a combination of what I suggested above. I think 9 total is a bit low though.
I haven't checked what the actual trigger arrangement is yet, but an alternative approach would be to nix the heartbeat altogether and switch to the triggers each spawning a single group.