I believe it’s the same study where developers were new to the coding tools, the one developer who had some experience actually saw a significant boost in productivity.

Experienced in...development?

or experienced managing humans (and therefore agents/LLMs)?

Probably your differentiating factor.

30+ years of experience here and I am definitely more productive using AI. However I don't think it is more than maybe 5% to 10%.

I think a Google study showed a 10% improvement at Google?