A few days ago I re-watched an old documentary on kava that features a mini interview with an elderly ni-Vanuatu grower who talked about a few different varieties they had in their garden. He noted that they like to switch between cultivars after a few nights when they get "bored". I know from personal experience that switching between cultivars seems to produce superior effects, sort of "refreshes the spark". than It's a purely subjective opinion, impossible to really validate it through any research, but something I've been fairly confident to be true. Does anyone else have any views on it? What's your experience?