Simple fix - If a ruler aligned with the center-line of your ship's base and starting at where your ship's bow or stern meets its base crosses or touches an enemy ship, you may declare Firing Chasers. The target draws one Damage from the appropriate bag. Chasers do not require a reload time (only two as opposed to a full broadside), and do not affect reloading and firing of Broadsides.

Sound like it's something ready for playtest?