What Starlee said.
I'd also emphasize angle at which you're holding your pen. That can have a great impact. Also, some individual pens are more prone to catching if they have a manufacturing defect. If you have another Nikko G, try a different nib. If it still catches, then it's your technique or paper.
That all said, I'm curious about your choice of an oblique holder for cursive handwriting. Nothing wrong with it, no judgement here, it's just not a traditional choice. Most people used straight holders for normal handwriting, back in the day, and used oblique for copperplate or decorative handwriting. That's why there are soooo many more vintage straight holders around.
I'd be interested in seeing an example of your handwriting.
Andrew
whose main interest in using dip pens is normal, cursive handwriting rather than calligraphy.