Well I changed to the Vee Tyre and this issue was totally gone.
I guess technique can be related to this topic but I think if it come out of the blue with new gear - checking the tyre aspect is key.
I suspect tyres can have a “working” sweet spot where rider weight and linked PSI all align to mean they work well - no camber. So I may return to the King George when I get to my 75kg aka “Unicon 21” weight as bet being at 45PSI and that heavy would help.
But Vee Tyre at 49psi and me at 81kg - and zero camber is a compromise I’ll accept for the moment.