On top of that, the arcs themselves were wildly out of scale with each other with the side arcs being much bigger than the front and back. Now I can see some semblance of adherence to starship design there (the side arc isn't blocked by anything like engines unlike the other arcs) but it doesn't make for a very fair distribution. On top of that, the rudimentary ship construction rules allowed you to assign multiple arcs to a weapon for no additional cost despite the additive effect. A weapon that only fired in your front arc costs the same as an identical weapon that fires anywhere in your forward, port, and starboard arcs combined (so basically only excluding the straight line right behind your ships).
In one of my first house rules ever that I came up with (this was my first wargame after all!), I decided that the arcs needed to be as equal as possible and to follow the shield arcs at least partially. I evened out each firing arc to three shield arcs each. For instance, the forward arc would now encompass shields 1/2/3 on the diagram. The forward/port (F/P) arc would instead be 6/1/2. Port is made up of the full 1/6 shield arcs and the corresponding port halves of the 2/5 arcs. They pretty much all equal out to 180 degrees roughly now and mostly correspond to three shield arcs. The only outlier in this system is the rare ship that uses F/P/S which only excludes one straight line on the entire hex grid; those ships would instead have their WDF increased by a flat 10% overall to account for the almost full 360 degree firing arcs. Thanks to Christian Wimmer for making the original version of this images up for me in order to help explain the new arcs!