The game has also gotten a lot harder since then (unrelated to the time / round thing), which might be affecting your experience of the game. I'm currently working on an update that will fix the difficulty.
Can you fix the final dial to have a larger "success" wedge, say half the wheel, but have it decrease in size by XX% for every subsequent spin?
Is this an idea for how to make the game less difficult, or is it trying to solve a different problem?