If you like a weapon and it's powerful use it but there's a way to make it better, when the enemies are about to die use that weapon but it'll take a few of these combos to get results, after doing that 20 times compare it to the same weapon and the stats are better.
To be honest I thought he'll be harder than Statius but he's nothes like the 4th boss in hardness. All you have to do is use the Emcon when he teleports to you or his attacks will hit you. When hes far use a tetra laser for his health goes down fast for that. After all these tactics youll beat him and you start all the way over but the enemies are harder.