I believe that at the moment, the nex is far too over powered. If you get a lucky shot in on someone, then that usually ruins their armour if they are stacked, or puts them in the critical if they aren't. I think it's a bit crazy to have a weapon that will deal only 10 hp less than the amount of health you spawn with.
In my opinion, the nex should deal less than 100 damage. You wouldn't be able to tip the battle to your favour with just one lucky nex shot, as easily, but if you're good, it would still allow you to destroy another player by continuously picking them off with the nex.
Another problem in my eyes, though not as bad as the damage, is the push. With the nex, you can launch someone from base to base in capture city in one shot. It's annoying when I get hit and end up on another side of the map, or someone can fling me into the abyss at the spawn.
So my idea would be to lower damage to 70-80 and reduce the push a bit. Again, the push does not bother me as much as the ridiculous damage does.