I have one of these and it does pretty good. I don't have my build available and I haven't played him on awhile, but with the changes to FA recently the set should do pretty good. SS/FA would be faster, but I don't think it would be by much.
Try to get some defense and a lot of recharge. Lightning Rod is on a long timer and lots of recharge can make it available every group.
My Elec/Fire brute was 37ish when the changes to /Fire Aura happened, and following that he has become my chief farmer. I run +2/x6 for speed and aoe caps, he's level-locked right now at 40 (went from 37 to 40 in about 2 hours) because I really don't want my first 50 to be a farmer. I'm really hoping to have my Warshade be my first 50, for the irony.
As far as a build? I took the Resistance toggles and passive to cap out my Fire resist, the damage powers, and the AoE attacks from the primary (except Chain Induction--I still dislike that power from when it was bugged). Almost all SO slotting. Attacks 1 Acc/3 Dam SOs and some Recharge where there was room. The only IO in my farming build is the FF: +Rech proc in Thunder Strike and the Kismet: +Acc proc (so I don't have to bump up to 2 Acc/3 Dam in my attacks) in Combat Jumping.
I use a custom AE farm of Fire Melee/Fire Blast enemies set somewhere between Hard and Extreme (but custom picks so they're all 100% experience). Two AoE attack volleys: Build Up>Lighting Rod>Burn>ST attacks on whoever survived and when that's recharging, Fiery Embrace>Consume>Thunder Strike>Burn>Jacob's Ladder/ST attacks on the survivors.
I can reach the ticket cap in about <10 minutes, clear all in about 15-20 if I take occasional breaks between mobs.
I also built a Claws/Fire brute that runs this same farm, it's only 24 at the moment, but it runs it pretty fast. 15-30 minutes to clear all and hit the ticket cap (running at +1/x6 until his slotting improves).
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I did a search but couldn't find anything. I know most go with SS but how would Elec/Fa do against some big mobs?