But you're running wheel spacers aren't you Hayesey?
It's a BRILLIANT frame, I am very impressed by the whole package and the quality of workmanship, but without spacers my 14x6" ET38 'Scalas' do scrub the arms on full lock. The castor is adjusted to match g-ladseite block measurements. Only rubs a little mind. I've some 5mm spacers to try and resolve it.
Mine is one of the early frames, but I don't know if it makes a difference.