Well, let's say the honest and real thing: in Infinity the circlekerk is possible just because the "looping STD missle" trick and the over-homing launch precision on QAAMs. And also the turning abilities of the planes in this game at high levels. So it is all of matter of the upgrade system in this game which is actually good, but make it feel much less an AC game. So the most important thing is to shoot missiles, not shooting them in an accurate manner. And this causes the circlejerking.
You gonna never be able to do this on a AC2, AC4, ACZ or any other pre-7th gen ACs. There you would actually had to place yourself behind the enemy or try to get in a "Cipher vs Pixy mode", making almost impossible the PvP and in fact in those games there wasn't online multiplayer modes. Although, watching a split-screen video on Youtube, actually it was really good, maybe even than AC:I. This because it's true that missiles are worse, but also the turning capacities of the planes are very low, so actually the accuracy of the missiles was good, honestly.
With 7th gen consoles it comes AC6 that gives us the ability of "High-G turn" by decelerating while turning and in fact here a serious PvP was introduced. This makes easier to put yourself in the tail of the enemy, but because you have to decelerate it will be easier for the enemies to hit you too, although the missiles in official games are slower and have worse homing abilities.
To make feel Infinity like an official AC game, you have to fly:
- Up to ACZ: low to mid tier planes at lv1 and never use deleration while turning (to avoid High-G turn)
- AC6: every kind of planes, but keeping them lv1.