OK, I had a look down below, and yes the primary was sitting quite high in the cell. I've wound it quite a way down, recollimated, snugged up the locking screws, and given it a test. A lot less error now, only about 1.5mm end to end.
I think the remaining flex is in the spider, it does seem quite weak.
Thanks for all your help guys.
Cheers,
Jason.
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