Scion Onigoroshi stuck

I have been running this Scion build with Oni goroshi, was fun and easy wit ha 6l item to start with. with decent gear i ended up doing all bosses pretty easy even Kitava with different builds i had a problem with this one i ended up doing it with one try.

I am atm doing Maps and other stuff. I keep dying alot from Syndicate bosses like one shot. I have to try alot to avoid some of their attacks and with a lot of patience i end up doing them.

Any suggestions as to what to fix or to improve in the build would be great. Thank you.

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