I referred to the other thread " Help, terrible beating noise".
Following the journey of @i3sven it is not triggered by lacking lubrication nor bad linear rails as he still has this issue after replacing all linear rails. Last suspect was stepper motors running too hot but final confirmation still waiting for. So the reason is currently unknown.
Obviously this beating noise cannot be fixed by modifying the hotend but it could be the bad quality of vertical walls was in fact a secondary effect of the hotend issues and not primarily caused by the beating noise issue. But as you don’t see this issue on your J1 only @i3sven can answer this question.