Performance test Keycloak on K8S

Configuring the server
1

I have a problem with ram in k8s.
My scenario 800CCU for 5 minutes

I testing performance Keycloak on K8S with configuaration:

replicaCount: 5

resources:
requests:
cpu: 1000m
memory: 2048Mi
limits:
cpu: 3000m
memory: 4096Mi

autoscaling:
enabled: true
minReplicas: 5
maxReplicas: 15
targetCPU: “75”
targetMemory: “75”

And, my problem are is the requests cannot be divided equally among each pod so some pod always run max 4GB Ram and it has to restart.

Is there a way to free up ram on the pod?