Just for grins, set up dss nics in seperate subnets(as shown) with the VIP also in seperate subnets. set your default gateway on the default management port.
Go to the console(CNTRL+ALT+T) and try to ping the other servers IP's.
No need for VLANS, just make proper gateway assignment, and configure router accordingly.
Even if the machines are connected together on the same switch, you should be fine.