MM build
That’s close to what I ran as a power MM reaper build before I switched to full viper condi. It works great solo. However, I prefer axe/dagger instead of staff (still carry the staff in your pack) because then you can run the speed trait for wielding a dagger in Blood Magic and drop the speed signet for either a ranged bone fiend (for a second bar break ability) or another shout or signet. I also like Decimate Defenses in Reaper because in open world situations the bosses will have lots of vulnerability stacks.
There’s also another MM thread just 3 or 4 threads below that has a lot of info.
I used your build #2, but I used full zerker gear with Scholar runes and Sigils of Air instead of Accuracy. But if you want to sacrifice some dps for more tankiness then by all means add in more toughness or vitality. I didn’t feel squishy in zerkers because of all the life steal from minions when running Blood Magic. For fractals and dungeons I often switched out one or 2 of the minions for additional shouts (particularly fractals that need boon strip).