@Josh Davis.7865 Maybe instead of outright nerfing power mechanist, because dps-wise it was alright in that it was on the level of condi virt, condi mech and the likes, maybe shift the dps from the Jade Mech auto attacks to its active skills or to the Engineer even. Also, since you are taking a look at Aim-Assisted Rocket, instead of activating on Jade Mech crits, maybe tie it instead on skill activations then adjust the numbers from there? That would promote more active gameplay rather than passively letting the Jade Mech do its thing.
While we're at it, maybe take a look at Tools traitline as there's some potentially interesting alternative playstyle in there, especially for Mechanist. It just couldn't compete with Firearms at the moment, numbers-wise. It also fits with Mechanist, thematically IMO.