Sorry but I couldn't help myself. Another way for board to pull harder than modifying with added weight, is the position or location the line is attached to the board.
How many lines max do you intend to run off those boards on each side? The charters use big boards because they use 4 to 6 lines off each board. If you are using 3 or less lines off each side, you would be best to use inline boards.
The absolute best setup to run cranks is with mono off inline boards.Most all agree to that.Good luck.