Angular Universal Load Testing

I am testing my Angular Univeral Application which is deployed on App Engine with F2 instance_class which has 512 MB memory 1.2 GHz CPU. I am using Artillery to do the load testing. I am new to load testing and its figures so not able to understand is my figures are correct or not.

I have tested on single instance it is taking upto 70 req and giving the 200 for all. Now I am doing the load testing with below values and here is what I got. Not able to understand if I am doing right?

http:
    extendedMetrics: true
    timeout: 60
phases:
     - duration: 60
       arrivalRate: 5
       name: Warm up
     - duration: 120
       arrivalRate: 5
       rampTo: 50
       name: Ramp up load
     - duration: 120
       arrivalRate: 50
       name: Sustained load

Load Test Result

Here are my questions.

1. Is App Engine is good for deploying Angular SSR/Universal with large data operations?
2. Are the figures seem correct for Load Testing?
3. Do we do such heavy load testing with a Cache or without a Cache?