Have you considered checking out nibs from the Indian company Ambitious? They tend to write surprisingly smoothly considering the price (at least according to my experience), though unfortunately they often seem to turn up in pens with feeds that don't work too well.
I know them, I met them in Frankfurt in "paper world", nice people. I met them two years ago while meeting with Jowo, and I check their nibs. Actually from them I had samples, I've been trying to contact them, but with no success, as i have one of their titanium nibs, but I had some issues with it. Maybe is the feed, although we make our feeds eventually, but unfortunately I have not the original feed, so I have no idea, it has a stamp from a japanese online retailer that was badgering some pens, I've checked them but now they use bock. So far the only two that are using titanium are Bock and them, if somebody know a third, message me, because I think that's it.
They also say they do "music nibs", maybe they are doing the nibs on the noodlers pens, I have not tried those, only the regular steel ones and one in titanium. Unfortunately I have not tried enough their nibs, they seem to be compatible with the 250 Bock, so, a bit under 6, a nib I have tried quite a lot (bock 250) in early pens before switching completely to Jowo and you can see in almost all pens in kickstarter. If the nibs are good I wouldn't mind considering them, but only the titanium ones, as i don't have a titanium jowo, nor Im in the position to make them do a custom nib in titanium, that cost pots of money. I've tried their other nibs in paper world, but I reserve my opinion. Overall, they are nice people and they seem to be pushing into making quality things, they also make if Im not wrong a 9k nib....I wonder if it would be possible for them to make something close to a vintage, that kind of nib we all know that's flexible, its not a flex, but if you push it you get that line variation, I like for drawing, others here Im sure they like for writing. So by now this pen with the vac system I have will go out with a 14K Number 6 Jowo EF/F/M//B/BB custom grinding and all the flowers, maybe Rhodium plated, but I don't see the point of plating gold, so I don't know (stay with what ya know) as the pen is all new and the most complicated design from me to date, so I don't wanna screw it up with nibs I don't know, Today I have been testing the third prototype now with a Number 6 Jowo, and a new button design for cap posting, so the pen is ready. Alternatively I have tried it as seen in the pictures with the 250 bock in titanium and steel, also with the indian nib (yes, I tried it, but the best results are with the number 6 Jowo). In any case the feed will be the one seen on the pictures, a carbon fiber custom feed with an extended capillar surface to increase the flow. So the pen is more "wet" than with a regular feed.