So, everyone seems to love the Mobile Arc. So, why not give the ships with a 360 arc a reason to give it up?
The biggest incentive to give up a 360 in favor of a Mobile Arc is point reduction. I think this could be done in a simple way:
1) Mobile Turret Retrofit.
Your upgrade bar loses all secondary weapon icons and you cannot perform primary weapon attacks outside of your primary or mobile firing arcs. Reduce your point cost for this ship by 20%, rounded down, before applying this or any other upgrades. The attack value for this weapon is your primary weapon value. You gain one additional modification slot.
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This leaves no room for someone to have a Mobile Firing Arc AND a turret, a primary 360*, or an Outrider cannon that shoots 360* You can now run the Decimator with Palatine and Gyroscopic Targeting for 42 points. This does not strengthen Torp Scouts because they lose their torps if they use it. If you put this on both ships in the Dengaroo build it gives them 11 more points... not enough for another ship, so this doesn't strengthen it.
Here's a build idea:
Patrol Leader (42) VT-49 Decimator (40), Mobile Turret Retrofit (-8), Emperor Palpatine (8), Gyroscopic Targeting (2)
Countess Ryad (35) TIE Defender (34), Push the Limit (3), TIE/x7 (-2),
“Omega Leader” (23) TIE/fo Fighter (21), Juke (2)
Is this a bad idea?