I agree with 4 and to a degree with 3 but 1 and 2 are simply the weapon’s identifying characteristics, if you don’t like it play a different weapon.
I dont know the exact break points you need, but mine has above 70 in all stat categories, although damage and stopping power are the only real relevant stats for a 1 shot i believe, i also use the talent in the last column that gives more damage to ogryns and monstrosities during ult.
I also have 8% elite damage and 25% carapace damage to deal with maulers and crushers, with the carapace armor damage i can one shot crushers during ult if i get a critical to its head.
My blessings are all stagger related, so are not really relevant when it comes to getting a 1 shot.