Thanks. Got it done.
Tines were too tight.
I had checked earlier today after my previous post, could barely get a brass shim in there. May have been my fault during disassembly or reassembly last night. I mean it has some decent wear and tear, and had dried ink in it so in all likelihood, it wrote fine when put away and forgotten about all that time ago so likely the problem was caused by me during my thorough cleaning.
Took it apart again, cleaned it, removed the nib, spread the tines a bit, checked alignment, threw it back together and just like that, a nice wet writer.