Because of the way the majority of dual-stage triggers work, planes with overwing guns are not working correctly.
Dual-stage triggers work fine when the guns share the same aiming point as in WWII MG/Cannon armed planes. With the introduction of the overwing guns on the SE5a and Albatrose DVa, overwing guns are assigned to Weapon group 2. With this configuration, the main guns on Weapon group 1, have to be engaged in order to fire the overwing guns on Weapon group 2. This breaks the cohesion of a dual-stage trigger and causes the two different firing arcs at the same time.
For example: My dual-stage trigger is configured as Weapon group 1 on stage 1, and Weapon group 2 on stage 2. On most of these triggers, stage 1 has to be firing in order to engage stage 2. This works fine as long as all the weapons share the same firing arc. But on the Albatrose DVa, the overwing guns fire in an upward trajectory away from the main guns. But in order to activate them, I have to also be firing my main guns. This problem also arises in the SE5a when the overwing guns are set to the upper firing position.
On the Sopwith Dolphin the overwing guns work correctly only if both overwing and underwing guns are equipped. This is because it correctly assigns the main guns to Weapon group 1, underwing guns to Weapon group 2, and overwing guns to Weapon group 3. But if you only equip the overwing guns, and not the underwing guns, the overwing guns are then incorrectly assigned to Weapon group 2, creating the same problems that exist with the SE5a and Albatrose DVa overwing guns.
The solution is to always have overwing guns assigned to Weapon group 3, regardless of the aircraft or other mods that are installed on the aircraft. This way dual-stage triggers can be correctly used on both WWI and WWII planes.