I'm happy to share. 😊
If it is not fruitful, I hope it is at least fun!
You mentioned that your writing is on the smaller side. I, too, appreciate having the option to write tiny. With that in mind, I'll suggest you take a look at Pilot's CM nib, which is found on some Plumix, Metropolitan, and Prera pens. They are dry nibs.
If you want a smoother experience, the 1.1mm stub on the Monteverde MVP (a #5 Jowo nib, I believe) loses the dry feel while still providing a thinner-than-average 1.1 line.
The old school Sheaffer No Nonsense Fine Italic nibs create relatively thin and crisp lines, but their edges are unforgiving when compared to the stubs above. They're no longer manufactured so you have to buy on the used market, probably from India. Sheaffer's current entry-level calligraphy sets might be just as good but I don't know.
Lastly, Birmingham Pens offers Nemosine #6 0.6mm and 0.8mm stubs, but are currently out of stock. I have yet to try them but FPN seems to think highly of them and I am looking forward to giving them a try.
There are other good (and more accessible) options, but the above are the thinnest that I know about.