0.63 A/R T3 housing is alot different to a 0.64 A/R T28 housing, which is what Lee has. It's all relevant to the size of turbo in any case, and contrary to alot of peoples opinions, regarding turbine housings bigger isn't always better.

Also, I would definately NOT rely on compensation maps, it's a very bad habit and only takes for your lambda sensor to have a 'moment' and you're looking at a meltdown. Remember that you now have 1.4 bar of boost somewhere in the map where it didn't have 1.4 bar before, so that part of the map may have not even been looked at.