Your subconscious mind records your actions without judgment. It doesn’t know you missed the F# again, and AGAIN! Every mistake becomes part of your learning. That repeated mistake will to take on a life of its own, like a monster from a horror flick; it never dies and has a hundred lives to torment you with.
Slow, careful practice is the only route to success, to speed up before you have cleaned up will simply give you a fast mess.
There is no time like the present to be perfect!