The reason why most schools favor the LSAT more is that everyone took the same LSAT (or rather it was made by the same people) but colleges differ greatly. This is also why splits have unpredictable outcomes. Many schools see splits as smart people who are lazy (high LSAT low GPA) or Slow people who can study (high GPA low LSAT, slow because the LSAT is so heavily timed).
I'm a split (169, 3.2) and it sucks. Hopefully being a farm boy will help me look less lazy. The best bet for splits is to apply to an insane amount of schools. I'm stupid though so I only applied to three.