Don't use automap when VIP forwarding

That rule looks like it should work to disable SNAT for the specific IP addresses. I'm not sure whether you need to specify to forward if it's already attached to a FastL4 virtual server.

Are client connections being reset, timing out, or completing; but with the source address translated?

If you wanted, you could create a datagroup (class), with your source IP addresses:

class no_snat_addresses {
   network 10.10.10.0 netmask 255.255.255.0
   host 10.11.0.10
}

when CLIENT_ACCEPTED {
   if { [matchclass [IP::remote_addr] equals $::no_snat_addresses] }{
      snat none
   }
}

Aaron