Kuberentes delay HorizontalPodAutoscaler on pod startup

Question

Lets say I have 3 instances of my service. I get a spike of traffic and now Kubernetes HPA says to scale up to 4. For a period of time, about 90 seconds, the new pod will consume about 400% CPU. Thus that will skew the averages and Kubernetes HPA will say scale from 4 to 5 and it keeps in this cycle till the averages are low enough to account for the new instance startup spike and it scales down. How do I tell the Kubernetes HPA to ignore CPU metrics for 90 seconds when it decides to scale up?

Current HPA Configuration:

kind: HorizontalPodAutoscaler
metadata:
  name: my-app
  namespace: my-namespace
  labels:
    app: my-app
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: my-app
  minReplicas: 3
  maxReplicas: 15
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 95
    - type: Resource
      resource:
        name: memory
        target:
          type: Utilization
          averageUtilization: 95

I will also say I have dome some research and it appears that I can have something the below, but cannot find much good information on the stabilizationWindowSeconds and policies for the scaleUp Behavior.

behavior:
  scaleUp:
    stabilizationWindowSeconds: 0
    policies:
    - type: Percent
      value: 100
      periodSeconds: 15
    - type: Pods
      value: 4
      periodSeconds: 15
    selectPolicy: Max