These threads are so common here. Look, the shield battery shouldn´t be able to target air units. Then beef the air units a little bit.
I agree, two people with the same mechanical skill, if Zerg allows skytoss to essentially “creep” its defenses, it cant push them away. It will always lose below Diamond.
Your only hope is to not allow them to gain too many bases while banking bases and larva yourself. But again, that requires more “mechanical skill” too. Your other option is to break them before they get to that point, meaning don´t go 3 Hatcheries.
Essentially you have to be better in mechanics to beat this type of Toss.
But the Toss can´t make a single mistake early on. It has to know its build order, it has to effectively scout you, it has to not overextend, etc.
But yeah, as much as I try to defend the balance, which I think is fine…this makes for some pretty toxic games - gameplay wise.