yes you are correct. The normal castor angle is +3.50 degrees.
And yes the current castor on mine is 0.22 (L) and 0.53 (R). Yes I did see the Ironman correction kit. But as I had so much trouble from the local Ironman centre, I just refused to go back to them. I could call to a Ironman supplier in the next town and see what they have to say. I found it interesting that the castor offset is the same rated lift (50-75mm) as listed on the springs that were installed and also that it is 2 degrees (as suggested by ARB) ...