RMS Alterkation alingment questions

Gentlemen i just took my 67 gtx clone to the alignment shop after installing the rms alterkation and the i gave the tech the suggested settings he came back to me and said he could not put 6 degrees in the caster as was in the specs. when he finished i took it out for a test and as i was driving down the road each time the road surface changed the steering wheel would almost pull out of my hands and the car would dart to one side. i took it back and he said he would work on the caster. Is there something i am missing here or should he have known that it wasn't correct before he let me test it. Just wondering what i should do next if he cant come up with a cure.