Deadeye is one of my favorite legendary perks, but on my current playthrough i only have one so far, and i'm level 103 (built a few hundred copper statues to increase a few levels to speed things up a little as i've been trying out some different builds on the same character). But i'm using mods, so i can take that one deadeye perk and put it on any weapon i like, i have been moving it to different weapons every couple of days or so, currently it's on my Plasma rifle. If i was using the Wacky Weapons mod i'd be able to craft weapons with 2 legendary perks, which when i used it in the past would usually be deadeye and something else, deadeye two shot is rather overpowered on something like a handmade rifle lol (auto and semi-auto).
The soft aim assist in this game gets really annoying at times, and there's no way to disable it, i've always hated aim assist like this in games as it throws off my aim (slows aim down while looking near an enemy, but i hate it when aiming speeds change without being able to control it). That for me is why i like Deadeye so much, as it makes aiming easier, using jet/psycho jet is cool but i'ts best to only use it when facing many enemies at once.