Yeah im pretty uneasy with going into ubers with my DH too... Especially since i havent done them in SC!
Im really afraid of EHP requirements, I have 170k dps unbuffed but only 53 k hp and [email protected] res... What do you think?
i think raka will eat you in one hit if youre not careful. sk can be pretty confusing too with maghda. her locust in combination with random arcane spots and skeletton spawns is not to be underestimated. id first try it with a less squishy class f.e. barb/monk so you get a general idea of how to run them.
If you want to maximize dps for ubers, go with bola shot imminent doom as your hate regen coupled with DML that boosts it. Then use soj and embrace that boosts traps (echoing blast ofc), if u play with embrace that is, and just be very careful when you spam dps against the assault beast
Sentry is a must like you have also concluded and Marked for Death is also good for one of the DHs of the party to have but not a must.