Wow, if this question was asked 10 years ago, I'd have a definite answer right away. But as of now, my best advice is to check the ID section for guides regarding your 4th.
https://www.pso-world.com/sections.p...icles&secid=19
See https://www.pso-world.com/sections.p...icle&artid=452 for certain weapon types that you may prefer.