In case you haven't already, try several different kinds of paper and see if there is any difference. Not necessarily "better" paper; the smoothest writing I fe

In case you haven't already, try several different kinds of paper and see if there is any difference. Not necessarily "better" paper; the smoothest writing I felt recently was on the back of a receipt of all things. The steeper your angle the more the nib rotation matters so you can try adjusting that while holding the position which is still comfortable. Someone recently tried mine and had a similar issue because they held it almost vertical; pressure on the page helps spread the tines and allow ink to flow but not if it's stabbing. Holding the pen at a different rotation to suit their writing motion worked and made it more comfortable to use less pressure but it did take some trial and error.