@RGK1 are you or others generating any traffic on your connection that would cause the ping spikes? If you know the IP of the server in rocket league you could try and ping it with pingplotter and you should be able to see if the latency spikes happens on your connection or further onto the internet. Furthermore, recommended setting for target is 5-10% of interval.

ue0 (USB Ethernet) does not support ALTQ.