I'd say you have same opinion on the matter as me. Boroguro seems to be the most muscle relaxing with stone a close second, stone is my favorite as it is the most sedating and hypnotic kava I've come across. I also agree with Vecta that isa/tudei is a good painkiller but can be a little overkill for just relaxing muscles, unless we're talking about KBR's most recent batches which as are a little lower than boroguro. I think chief's is also a good muscle relaxant and a great root all around, I love the pine flavor as well.