What exactly do you mean by "one arm power swing", in contrast to a "regular" one arm swing?
If you mean shadow swings, as in, actively throwing the kettlebell back between the legs; I was under the impression those (shadow swings) were for two arm swings only, and at around 30% of bodyweight.
If by "one arm power swing" you simply mean a snappy, hard-style swing, then I thought that was the proper form anyway (for S&S).
If you mean just one rep at a time, and reset between each, then I can't address that. I've heard of that technique, but not with one arm swings, and I've never done them anyway.