I also got under 50%, started out with 10% actually, which finally went to 36%. But I feel like it's just because I threw in many of single keys in a row there.
That's what you need to do. Most people think streaks are unlikely, which biases people to void even small streaks. The algorithm expects that, so to fool the algorithm initially, you need to tilt towards streaks, and then when begins to pick up on that, tilt away.