Hi,
Everything looks fine except the FLOW CPU is spiking randomly, It mainly spikes because of the traffic. The session creation looks normal so there are chances that either ALG, bust in the same session or some other traffic invoking the high flow CPU. You may need to run the profiling on the device to see what traffic is causing the high CPU.
https://kb.juniper.net/InfoCenter/index?page=content&id=KB9453&actp=METADATA
Thanks,
VIkas