I tried it again today with enough toe out to scrub the tires in about 1000 miles

It is much better now but I don't think it will have much straight line stability. I found a few references on t'internet that seem to suggest that the IVA inspectors need to see some self centering effort but don't necessarily expect them to go right back to centre. Anyone got any comments on this point? If I turn about 1/4 lock it will more or less stay there, it will virtually centre from full lock. I might try more air pressure to see what happens.
Enoch.