you need to use augments, and components. Focus on pet speed for damage.
By looking at your grim calc, looks like 50% of your items lack components and augments
Get one point primal spirit at least, can dish out some dps. Also max your RR skills.
Otherwise, I bet if you send me the save file I can do SR 65 no problemo with this build. Maybe just get some augments and components as I said. I mean I have done with this build without any fancy legendaries and sets etc (WIP) [1.1.9.0] SSF Budget Bleed & Chaos Pet Conjurer (SR 65-66)