As it is currently, the leveredge is objectively worse than the long ranger in pretty much every way. It has worse single target damage, worse crowd clear, and worse unique jokers. As such it desperately needs a buff, but more importantly, it needs some form of identity that seperates it from the long ranger (which is probably the most balanced weapon in the game as of writing)
Stacked lever is a functionally useless unique, the leveredge is terrible for crowd clear and it doesnt proc against high health targets. If you want to keep it the same it should proc on weakspot hits instead, making it useful against high hp targets and the same against trash.
Eagle lever sucks. The consistency required to use it effectively is unreasonable, and even then it doesnt do enough to justify using it. Plus many things completely reset it other than missing, namely casting spells, drinking healing bottles, switching weapons, etc. It needs some sort of complete rework to become viable, though I'm currently not sure what so I'll update this post when I come up with something.
As an explanation for the long ranger comparison, long ranger does crowd clear better due to piercing (and technically mindshot), and it does more damage (and can hit the 100 dmg breakpoint easier) hence is better for single target. Additionally it has a much faster base reload, and the uniques are good and give it an identity. The leveredge does shoot fast than the long ranger but machinegun solves that, and as it does more damage it both uses less ammo and firerate matters less.