You get consistent by knowing what your mistakes are and how to fix and prevent them from happening. You can retry as much as you want on a map; in fact it's good because then you can pinpoint what you're doing wrong. If you blindly play through a map and then never play it again you're not going to understand what you messed up on. If you come upon a mistake, you make note of it and then try again and see if you're able correct it.
OD doesn't matter for training consistency and accuracy, it's an artificial way of correcting you which doesn't even tell you what you're doing wrong aside from too early or too late (which that amount of time is so small if you're not intentionally hitting for it you're never going to adjust correctly for it).