misc HA-questions

[MajStealth]

1. do i only need to enable promiscuous mode on a vSwitch in esxi, or also additionally, or only in the opnsense-fw?
2. is it intended to show me TB in traffic over a weekend in a not so busy environment? 1 VLAN only via vlan-enabled vNIC from esxi with promiscuous mode on vSwitch.
3 when i enable promiscuous mode on the vSwitch-NIC´s, HA works in the event that i shutdown the master, but not if i only disable the wan or lan-vNIC. the effected VIP switches but the rest stays at the FW without WAN, why is that?