I know this is an old post, but I was wondering if any one can answer this?
I have made a couple of batches of modelling chocolate with white chocolate, not this recipe though (yet) and it works well enough for what I have needed it for, except for a little problem with excessive oil. to the point when I knead it it runs down my arms I need to keep blotting it on paper towel.
I am guessing it is the chocolate I am using (nestle professional snowcap).
Any other suggestions what it could be, or a different brand of chocolate to use?