You're measuring binary outcomes, so you can use a beta distribution to understand the distribution of possible success rates given your observations, and thereby provide a confidence interval on the observed success rates. This week help us see whether that 4% success rate is statistically significant, or if it is likely to be noise.

I’ve only ever gotten, like, slight wording suggestions from reviewers. I wish they would write things like this instead—it is possibly meaningful and eminently do-able (doesn’t even require new data!).