Why is your first move not Hide --> Trick Attack, 400 potencty and 10% damage buff for all party members.

It also seems like Suiton Ninjutsu (Water Release) and it's accompanying effect will allow the use of SATA in battle. Whether like perfect balance or by hiding (likely the former).

If this is the case youll want to use it as soon as its cd resets, or if your in a fight with a heavy dps check, save it until then to boost everyones damage by 10%. Maybe put up perfect dodge if your mid fight aswell.

For poisons it's got to be viper for me, use mug as a hp replenish instead of changing silence for stun, great change; also noting that mug standard in party combat will be of little use, getting the killing blow with 200 potency is going to be difficult, its more of a solo farm thing.