Redesign Capital Sharp S?
The Capital Sharp S in Jost just does not fit in the overall design of the other capital letters.
I found #26 from a long time ago, and I think since then, the design theory behind this relatively new letter has improved a lot. See e.g. the article "How to Draw a Proper Capital Eszett" by Christian Thalmann.
IMHO the clear, sharp lines of the other capital letters in Jost should be found in the Capital Sharp S as well. It could be done with a straight line like a Z on the top right, what the above article calls a "zetoid" shape. I can imagine a corner on the top left, but a rounded one would probably look and read even better.
Here's the glyph from "Wayfinding Sans":
A shape like that but with pointy corners might work well for Jost.
Thanks for making such a lovely and versatile typeface available for free!