I used your build here, except I had to revise it for a scrapper.... I already had made a DM / Electric Scrapper months ago but didn't level him up until last week. I'm farming 54x8 without half of the IO sets (can't afford them yet), most noticeably, the expensive sets. Also, I was doing 54x8 with bosses without even the Alpha slot unlocked. So I think a "good Job'sir!" is in order for you.