Hey, when SSP first released the 64mm cast burrs it had a more brew focused geometry. This burr has a very limited espresso range (a few microns) that is very close to chirp. He quickly (within weeks) stopped making this in favour of version 2.
If you have v1 and want to try out my v2 then get in touch. I have tested the V2 out for a while and can confirm they have a perfectly normal range for dialling in espresso. I’m open to a temporary or permanent swap.