Yeah... No.
I've used thousands of miles, if not tens of thousands of miles of wire in my career. The HF stuff is inconsistently bad to horrible. Lincoln makes some of the most consistently manufactured wire products in the world. Fluxcored wire is difficult to make well, extremely difficult to make consistently well.
What you don't understand is that it may *seem* that fluxcore is simple, but it is not. Wire-fed welding processes are maddeningly complex. It has nothing to do with you being a bad welder and entirely that you are so ignorant of the process that it seems simple to you.
When you are beginning, you can't tell if it's the machine, the wire, the base metal, the whip, the tip, power issues (which you have already mostly figured out), or you. Starting off with inconsistent wire is only making it harder to troubleshoot the system.
You've not given an accurate list of everything in the system. The fact you are running on an inverter system via batteries needs to be checked. Have you any means to check voltage drop on your power line to the welder? Is your cabling proper size (10g prefered from the inverter to the welder keeping as short as possible)?
I appreciate any recommendations on which wire you like from Amazon.
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