No kidding. Cable clutches don't get tighter.
You can't always feel it when it's slipping and that additional heat will kill the steels in short order, if it hasn't already. When you finally pull it apart, you will see blue heat stress dots on the steels and you can't 3-d print those (yet).
Why so cheap? Just get a good clutch set of frictions AND steels and put it in, it's less than an hour job for pete's sake.