This is the base for adjusting the IOPS https://kb.vmware.com/s/article/2069356
You can also do this to all your existing MSA volumes.
for i in `esxcfg-scsidevs -c |awk '{print $1}' | grep naa.600c`; do esxcli storage nmp psp roundrobin deviceconfig set --type=iops --iops=1 --device=$i; done
To adjust the Vmware default path slection policy to use round robin
esxcli storage nmp satp set -s VMW_SATP_DEFAULT_AA -P VMW_PSP_RR
esxcli storage nmp satp set -s VMW_SATP_ALUA -P VMW_PSP_RR