Yeah the "let ink dry fully" thing is key. I read somewhere that the paper type matters too, like coated paper in some planners makes ink dry way slower. Someone tested a bunch of brands and the cheap absorbent paper actually dried fastest lol.
Totally, that cheap paper thing makes sense because it soaks up the ink right away. I have a notebook with that super smooth, almost glossy paper and my pens smear for ages on it. Makes me pick my paper based on what pen I'm using that day.