CP doesn't really work anymore (if it ever did). Black Foils more or less threw CP out the window, even for tournaments. We used to be able to gate tournaments with CP because you could just do RF and GF. GF basically just had way higher CP than RF. With BF you can't even really make it work anymore because you'd either have to set the threshold so high that GF would struggle to qualify with a max deck or you'd have to exclude BF CP.