A few minutes fast is usually due issue with the hairspring, dirty, magnetised, any issue that shortenes the working length of hairspring.
Auto bridge must be taken out to remove cock- balance assembly, then there is a good chance cleaning hairspring would suffice.
As gpraceman noted above, one of the differences appears to be hardware. Specifically, AmScope uses handles on all of the adjustment points, and one way costs are cut is to replace those with grub screws. That's easily remedied, as he also showed. Marketing budget is definitely another cost differentiator though. For my money knowing what I know now, I think I'd upgrade the hardware out of the McMaster catalog, and pocket the difference for 404s.
I have a vintage Wittnauer automatic that is running fast. I took it to my watch guy but he said it wasn’t worth fixing as it had sentimental value only. It’s only a few minutes fast per day so I’m wondering if there is anything I could do, given limited knowledge and tools.