I'm making progress. I did a test with a core cruiser and escort frigates. The cruiser ended up taking damage despite the PD frigates and was reduced to 1 move. The frigates stayed in formation moving about at 1 move.
I am trying to figure out the roles. Should it be core ships with heavy direct fire surrounded by PD ships? I am trying to figure out pickets. Historically they are to stop surprise attacks so what role do they have now. I'm thinking missiles to maybe damage enemy before they get in range of the core and escorts.