I use this putt exclusively. one thing I do is point my thumb at the target at the end of the stroke. In this way I minimize wrists flips. if I don't pay attention to the thumb pointing, the disc tends to error right or left.
Pitch putts in general erro up and down, which is what you want. Losing them right or left usually means you're flipping the wrist too much.
Also, always find a link to aim at, ideally a bit to the right of the center pole, since even a pitch putt has some spin that can send the disc off left. I know, Climo claims he can putt with no spini, but I've never been able to achieve this.
Regarding aiming at a link, the mind wants a small target to direct things. Big targets (such as the whole basket) create a situation your brain doesn't know what to do with. Your hand can end up wandering in somewhat more random ways with a bigger target. Lots of sports are like this, by the way. once you release the disc, don't take your eye of the link target. You'll be amazed when the disc actually hits the very link you were looking at. When the disc doesn't hit the link, you'll feel something odd in your mechanics that caused this. Freaky, I know. But it works for me.