I ran a 6 ship list the other day and it did great (4 CR-90s and 2 Mk2s with Ackbar).
I made one crucial mistake though, I had two CR-90 Bs, and 2 CR-90 As. My A's had enhanced Armament, which is great with Ackbar and Concentrate Fire! But my B's were unable to attack at long range, even with ackbar because they didn't have that first red die.
So I got to thinking that maybe a smarter way to proceed would be to put enhanced armament on my B's. It would make the entire ship 5 points cheaper than an A with Enhanced Armament... it would still be throwing 4 red dice at long range, and would still have a total of 6 dice at anything closer than long range (Assuming I do concentrate fire) - and that extra blue might even help stop my opponent from bracing.
In fact, I might never go with a CR-90A again!