From what I remember last year...the powers to be claim that anything given over a 2 fish limit would not make a difference in the catch. In other words, if the limit was 4 fish or 104 four fish, the average trip only produces 2 fish. Therefore, the number of fish allowed would not make a dent in the final poundage tally.
I know for a fact that last year, my trips keeper size average came out to 18 1/2". The bag average was close to 8 fish (7.8999 or something like that). These figures are with an typical crew of 5 guys.
The numbers I am using came from last years log. I had 60 trips with 461 keepers. I also note the size of every keeper fish on the boat every trip.