Pyros Light and Lines, what am I doing wrong?

[Shiroe]

At the beginning you want to accept everything that gives you more lines doesn't matter the stats. After that you can start with the actual "joy" of this weapon and farm light until you get decent stats.
Everything about this light step is frustrating not just the way to the 5 lines, exept you are one of the luckiest people alive.

this is what I didnt get at first and its total BS of SE not really explaining it better...

sure, many things in Eureka are not explained on purpose, but this "rng line" system is full retarted (sorry for the wording) and Yoshi should never have agreed to allow it in the game the way it is, without better elaboration