@rtwx I'm still learning some of the nuance, but seems the ink plays as much a role as the pen. These are all the same model of pen, different inks. The plain black from cross was the worst in terms of how well it wrote, all of them feathered a bit, but the iroshizuku was pretty nice, though i found the color to be a bit too light (not the inks fault, im sure its meant to be that color.

I can say this, the Diamine OX Blood ink in the good pen writes better than the Iroshizuku ink does in the knock-off pen. So in this case at least it seems the pen was working against me more than the ink.