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freddo
Thanks for this.
It prompted me to check the burrs on my giant Fracino grinder. Turns out I could run my fingernail along the edges without much resistance so I guess they're pretty worn. I learn the Fracino is a rebranded Cunill with 59mm burrs and get replacements which aren't sharp but they bite a bit.
First dialed in shot today and placebo or not it's a dramatically better. I think this might also be down to me realising how much I need to purge. On taking it apart I found what looks like about 15-20g sitting in the grinder, yuck.
After fitting with an empty chamber I got 10g less out than I put in so I guess I have to purge about 10g every time. No more variety bean subscriptions for me, I getting one bean and sticking to it!