Thanks Dale! I went in the complete wrong direction on the clamp tension - that probably hasn't helped me at all :black_eyed: I was starting at 25mm/s but will slow down some more, and tweak in the direction of your other recommendations too.
Also, anyone else think it's a little spooky how if we mention localfiend's name he immediately pops up in the thread?
Should we try this in other threads to see if works there too?