Weedehackers are for the strimmer not the bass,simple as that. People got into them to solve the string tension problem for slapping, for they work. But that stuff was never made to produce a musical note , everyone who uses somr type of weedwhacker has a complaint of some sort...the low E has no defenition theA string is too quiet etc.
The conclusion I came to a long time ago is that they just dont work.
Simple answer is to buy some guts, they were actualy designed to be put on s double bass!!!
I dont mean this to sound harsh, but Ive been through every string out there, so over time you learn a bit