I believe that the Fabian Strategy is underwhelming/underpowered. It's Archetype without being Up close is mediocre and upclose infront of an enemy, the increased RoF from the "Front Lines" Perk has suffered due to the Max Rate of Fire Auto Rifle nerfs. Not only that, but the reload is Slow to the point where you would lose the Crowd Control perk after earning a successful kill and reloading.
My suggestion is buff Fabian Strategy by Not Changing the Damage it does when switching Archetype via the "Front Lines" perk. I would also suggest combining the existing "Crowd Control" perk on the gun and combining it with another perk called "Feeding Frenzy" (Kills grant bonus reload speed) into a new perk called:
"The Strategy"
-Kills with this weapon increase Damage, Reload Speed, and +1 Armor (due to the ballistic shield on the gun). Stacks up to Three Times. This perk would be shown where I believe beneath or above the Kinetic Damage Slot of The Gun, replacing crowd control.
Of course, this just a suggestion but it would be nice if you could acknowledge it somehow with a buff.
Before I end this, to get the Fabian Strategy, you must complete a quest when you reach Gunsmith Rank 3, right after the quest for Immobius at Rank 2. Only available on your Titan.
Thank you for you time.
TL:DR
-Fabian Strategy needs a buff
-Make it so that you don't lose damage when changing Rate of Fire Archetypes from the Front Line perks.
-Combine Crowd Control, Feeding Frenzy and add +1 Armor into a perk that grants all three and Stacks up to 3 Times.
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It definitely needs improvement. I would love to see that Ballistic shield on the front of it actually offer some form of protection.