You don’t turn the screw, you move the little lever, and you only need teensy-tiny movements. And yeah, + to speed up, it’ll be a bit trial and error to gauge exactly how much or little you need to move it, but if you’ve got the app you can check each time.
There are actually two levers, you need move the top one. The bottom one sets the beat, leave that alone unless you really can’t get it running to time.
There’s tonnes of how-to’s on YouTube.