I have an idea, squadrons now have 2 formations available to them. The first, loose formation, provides the same bonus or lack of bonus as squadrons do now, with the same coherency requirements. (or if someone wants to define anything new, hey, its possible)
And then tight formation, new requirement of 5cm coherency, and needs to have 3 or more ships in the squad. Possible bonuses for tight formation could be +1 ld (ships closer together so easier to transmit/coordinate/relay commands), or ignoring of blast markers for purpose of LD for command check, shared turrets without being in base to base (or if not completely shared turrets, then a bonus to turrets somehow, like +1 turret strength for every 3 ships, or maybe being able to reroll the turret dice).
The basic idea is to spread the bonuses from having bases stacked or touching to a wider area, but only for squads where there are enough ships in the tight coherency where it makes sense that they can overlap enough nearby area to help their squad mates.