I have a Sheaffer Balance with a Feathertouch #5 nib. I am using Iroshizuku ink. The nib will lay ink in all motions but a 50° upward stroke with paper turned. This would mean the nib is moving almost due right in relation to my hand. It's fine when writing script but when practicing upstrokes (right) it will stop laying ink in short order. It does not run out on downstrokes (left).

The nib is a bit dirty in the photos but looks aligned to me and I can't see anything that would cause the right side of the nib to behave differently than the left.

Please advise.

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