Chinese pens almost always have a rather fine nib.
You may need to tune the nib. Using a magnifier, carefully inspect the tines of the nib - they should be parallel, and the gap between them should have a uniform width from the breather hole all the way to the tip. If the tines are splayed apart, the pen will lay a broader line (and use ink much faster).
Tuning a nib is not something that I would want to try to explain in a posting. If your inspection shows that the nib needs to be tuned, look into some of the YouTube videos by S.B.R.E. Brown.