A compliance lead wants the router’s threshold lowered...

Treating this as a binary global-threshold trade-off is a mistake. Instead, recognize that relaxing the threshold scales cost linearly with the number of sources. You should segment traffic by query class, ensuring only audit-relevant traffic receives the recall bias or a forced full broadcast. Furthermore, use the sampled-broadcast audit trail from routine monitoring as evidence of system coverage, which proves the system’s efficacy more convincingly than a permanently lower threshold.