So, I just realized that there is a concept from late 1800s and early 1900s naval combat that may apply to SW naval combat: salvo fire.
The idea is that if a single gun is fired at the enemy you don't know whether any inaccuracy is due to an error in the targeting solution, or simply caused by dispersion, and with two guns you can't tell which is closer to the point you are aiming at. Three shots means that you can determine where your aim point was in relation to the target as long as only one shot is notably off from the aim point. In order to be able to reliably determine where your aim point is relative to the target, you need four shots. This way, even if two of them are off due to either a slight misalignment of the guns or simple random dispersion, it is absurdly unlikely that they will both be off in the same way, leaving you with at least two shots relatively tightly grouped together at the aim point.
Even if the precise number is different, something similar is almost guaranteed to exist in Star Wars naval combat; there is likely some minimum salvo size below which accuracy rapidly drops.
If we could find out what this was, and then ensure that as many of our ship designs as possible can bring at least this many main guns to bear in any given direction, we could use this as a major advertising point.