One thing stands out from your first post... the ovf export failing. If you watch this operation in vCenter, does it timeout in vCenter? Or do you get the timeout error and vCenter is still getting the export done?
If failing in vCenter that is an esxi/vcenter issue. If failing in vCC but still going in vCenter - tkae a look at the vCloud transfer timeout settings, they are VERY short by default - export can take hours (I have seen 10+ for a mid size vm).