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Some of the SAC methods only work when a large percentage of the points are part of the target model. You might want to try using a different method, though I don't know enough to suggest a specific method. Examples are RANSAC, RRANSAC, MLESAC, MSAC, etc.
Also, the number of iterations might be important. I'm unaware of what the default number is, but if it's low, pumping it up might help (but will slow things down).