Tgufyru, Crawdaunt is an exceptional breaker on Rain and I think CB is a great item for it. Some of your sets aren't very optimal, however. For starters I would advise against using Slowking-Galar on rain. It doesn't abuse Rain very well and it drains momentum from your otherwise offensive team. Try replacing Slowking-Galar with a Choice Band Barraskewda and making Seismitoad Choice Specs.
https://pokepast.es/8ba879dff988bdd5
not perfect but i believe it fixessome of the flaws while not changing any mon (tho i believe barraskweda is better than shifu but that's that)
anyways! hope you like it :DD cheers