I have discovered over the years that I really like the riding crop as an instrument of correction. Nothing else comes close in terms of accuracy, controllability and range of effect.
With LK in position 3 (Kneeling along the edge of the bed, head laying on the bed and hands behind back) and handcuffed. And after some warm up spanking, she was ideally positioned for riding crop to the arse, back of thighs and bottom of feet. I should point out that she was already highly aroused by this time and that every strike or two I checked she was OK. Also safe words were in place.
Earlier with LK in position 1 (standing, legs apart, hands behind back) I had been walking slowly around her running the end of the riding crop across her body. Occasionally I would tap her lightly with it on the bum, tits, legs.