IMHO the character has always to overcome the RR result to break control. But, the amount of failure will increase the difficulty of the roll. Basically you should use the value given in the table, ignoring the "Breaking Control" paragraph (that's need only for completness, I suppose, since it says nothing more than the above paragraphes...).
So, if you fail you RR by 10, you have to overcome the RR number by 10, if you fail by 20 you need 20 more of the RR result, and so on...