With Admission control disabled, HA will try to restart VMs without checking the available slots, so VMs may or may not power on depending on available resources. Without Admission Control enabled it's up to you to ensure enough free physical resources in case of a host failure.
das.maxfailure is set to 3
Although 3 is the default anyway, I hope this is a typo. It should read das.maxFailures (with an "s" at the end).
André