Far back are the good old times when there existed only ONE primus fleet....
Thaddaeus, Emma, Flynn, Violette, FS. The latest fleet of that type I used made 220M damage per round (DPR).
Sure there have been some rare fleets with St. Nick or district-unique fleets with SS Carter or SS Arturis but besides that... nothing.
I remember when I got Flynn, finally, from Celestial Portal after hours of Quarks farming, it felt like achieving a life-time milestone.
Well the evolution of commanders affected Primus fleets, too. E. g. we saw the Cryptor Cabal/Alfred variants.
TS-4 Modules allowed to rely on dodging Primus and so I played Thaddaeus, Dor, Retrobot, Emma, FS for long. If the Bot dodged Primus that was like another lock. This fleet made reliably 350M - 400M DPR with up to 800M DPR on rare occasions of multiple Bot dodges.
The next stage came with Ursa. With high block on Cryptor those fleets (incl. Flynn/St. Nick, Thaddaeus/Emma) beat all previous types in terms of reliability and damage. A server mate who used this fleet first on my home world made 800M DPR short after he started to use Ursa.
But tap4fun did not stop here with Primus-capable commanders: Louise, Burglar Kate, Caroline.
Strangely with so many options there are fewer Primus informations in the public than in the past. Maybe the majority of players just sends a Primus Robot most of the times and especially on merged servers you are happy if you make a few shots on Primus and don't care for optimization.
Nevertheless I am interested in your current Primus fleets and forms and will share my currcent one, too.
I use Burglar Kate (1), St. Nick (2), Dor (4), Caroline (6), Ursa (9). (Underlined commanders in main formation, too). Depending on the number of dodges by Dor I make 1.7B - 2.5B DPR. (Dor has 99% dodge.)
Sharing commanders between Primus and PvP formations has the huge advantage that your Primus fleet improves permanently from Dark Aeros, Legendary Equipment and Augmenation.
So what Primus fleets are you using? How much DPR can you deal to Primus?