unused active workers during stress test

I'm trying to stress test my endpoint with 30 requests at once while I have 5 active workers. I'm hoping to have 10 active for resilience during a demo. However, one of the workers is never touched. It seems that no matter what, I can't escalate past 4 workers at the same time when testing 30 requests. I'd prefer it to use all of my workers if possible. But there seems to be no way in Runpod to configure this beyond setting Request Count to 1, which I already have.