Midori Urushi. My Nakaya has a flexible medium nib and it's a stellar performer. i've neverhad any issueswith ink flow. The only negative remarik is the ink-capacity of the converter. It's too small for my taste.
I've also read many coments about problems with Nakaya ink-flow. However, I've had none. I hope they can fix your pen soon.
Good-luck.
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