IP Forwarding Virtual Server v/s SNAT

For testing, i created a SNAT object, added the two private nodes in the inside address list and, and gave their vserver as the outside address. "tmsh show /sys connection" showed all traffic sourced from the nodes being SNAT'd to their vserver address. We do want traffic to get SNAT'd but only for destinations off-campus. Is there any way to do that by creating a SNAT object.

can you try something like this? only virtual server is used (no snat list) but upstream device needs to have route or arp for 190.191.192.193 (to bigip).

root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm data-group internal node_address
ltm data-group internal node_address {
    records {
        10.10.10.1/32 { }
        10.10.10.2/32 { }
    }
    type ip
}
root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm data-group internal campus_address
ltm data-group internal campus_address {
    records {
        65.66.67.68/32 { }
    }
    type ip
}
root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm rule qux
ltm rule qux {
    when CLIENT_ACCEPTED {
  if { [class match -- [IP::client_addr] equals node_address] } {
    if { [class match -- [IP::server_addr] equals campus_address] } {
      snat none
    } else {
      snat 190.191.192.193
    }
  }
}
}

Would really appreciate any suggestions/pointers to my second question.

it may be easier if you can provide some example.