Answer:
If several peer reviewers were not convinced by the evidence you already have in your report.
Step-by-step explanation:
In order to have a strong claim, you need strong evidence. If peer reviewers were not convinced by the evidence you already have in your report, your evidence is probably not strong enough. If you have a lot of time before the report is due, it doesn't mean you should add unnecessary evidence. Same with a lot of extra evidence. If it's not strong evidence that will greatly influence the opinions of your peers, it probably isn't necessary, and shouldn't be added.