I don't really think it is OP. I have the Efrideet's Spear with all of the perks you mentioned. I'm not going to lie; it's a beast. It isn't OP for one single reason though, you don't have infinite ammo. It isn't something like Thorn (just an example people, calm down) where it kills in 2 shots and you can do that forever because you always have ammo.
Yes, you have 1 guaranteed body shot kill per mag, but you don't have enough ammo to make it more powerful than any other special weapon. With Praetorian Foil I can 1 shot kill most of the time, but I have a lot more ammo for it than Efrideet's Spear. The same can be said of most shotguns.
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My spear has performance bonus and final round. I don't actually use it often, but its fun when i do.
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He said Thoooooooorn!!!? I'll have you know I typed this with my middle finger in a public space to let those around me know my anguish and disgust!
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^This. And even if you do have final round, if you shoot rounds just for the final round in the mag, you'd only get a kill or two for every special drop. It reduces kills per game and shotguns would most likely outperform final round snipers based on kills per special ammo drop.