Currently I am doing blackletter calligraphy using Pilot Parallel pens. I was tired of relying on ink cartridges, so I bought a set of C-series nibs from Speedball to use with the inks I use for copperplate. I think I cleaned them well, I used soap, hot water, a sponge, and finished with rubbing alcohol.
The ink appears to wet the nib evenly, but when I first press down on the paper (watercolor paper, which worked very well with my copperplate work), the ink flows out so fast that basically all of it is exhausted just on the first line that I make. I've tried with both Pelikan 4001 and Rorher & Klingner Salix, and the same thing happens to both.
What could be happening here?