I struggle at doing pinky flick R'. So I do Index finger push for it. I know all of OH fingertricks but can't turn fast. That's the problem
You will get faster. It takes time though. If you do an average of 100 everyday (or just an hour of OH solving), compare your times today to your times next Monday. You might not notice a difference between each day, but you will have improved a lot by the end of the weekThe best thing to do right now is just to endure being slow and do 100 solves.