Yes, Hidden mode would be good.
Simply
Encrypting the node also slows them down.
Doing both, on top of the already very-strong Firewall setup described above, basically means
you will never be hacked-on-the-fly during a combat. Now, a canny enemy hacker might Shadow you for a while, and take a more careful probe-and-prod approach. But that presents it's own difficulties to said hacker.
