We hit this too, and what helped wasn't more reviewers. We pushed the trivial checks (style, obvious bugs, secret and other deterministic scanning) onto automation so humans only look at intent and design, and the trap to avoid is letting AI both write and "review" the code, since you want the review signal independent of what generated it. There is another way we are experimenting these days too - building a gauge of how much a human in the loop is needed based on our confidence on the changes AI analyzes.