The ARBs do seem to move laterally on lowered cars. Maybe due to knackered outer mounts, or try a pair rings abuting each mount to stop it?

I discovered Blue 2 had eaten a Compo after it was (effectively, as a Cinq) written off.

your car is not too low mate ,,,

when mine was on 60mm drop all round i used spaces to be sure of clearance on full lock either way,never had parts eating wheels

I had this when they were on the red sei with the valbrems... iirc it was the track rod end catching on full lock... took a grinder to the trackrod end and was fine