Ah, I did forget about Lightning Reflexes.
The 3rd recharge wouldn't hurt when facing -slow mobs though, Cryo Tanks anyone ?
I don't auto-brawl. I normally face large mobs, and get agro for my fury, on top of regular fighting. And will take advise on power sink. I have rage for my non-fury damage, works great, and I find personally slotted health DOES make a difference. It can in some situations make the difference between my health being near full to gradually slipping down, and in long fights has a great return IMO.
And btw, boxing costs more than brawl. May slot it, but It's not a priority atm.
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You want 3 rchg in Rage , to make it perma.
Also, consider putting a 3rd dmg in KO Blow, I know a lot of brutes don't slot dmg at all on their attacks and rely purely on fury, but those are the same people that usually cry when you pull out a 900+ KO Blow with 3dmg + full fury on an AV.
That 3rd rchg on power sink isn't really needed either imo, it already comes back pretty damn fast.
I'd also say drop 2 heals in Health, and slot boxing a bit more so you can use it instead of auto brawl, it costs less end than brawl, and actually does dmg, for the same recharge time.
And overall I'd slot at least 2 dmg in each attack, but that's just me. Fury is all nice and well, but doing dmg with zero fury is nice too.
Last but not least, I'd prolly drop the dmg in lightning field and slot a taunt in it, but that's a matter of playstyle.
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Ive slotted my SS/elec with 2 acc/3dam/ 1 end or rch in regular attacks; with rage with 3 ToHit buffs I can hit anything short of a storm troller in PvP(for which I go and get 2 or 4 yellows and chase them out the zone). For my em/inv Ive had to 3 slot acc since the ToHit buff is only 10sec long. I do notice a large difference between 2 and 3 acc just in PvE. When I solo on relentless and am bang away at a purple boss the last thing I need it to miss, since its often a balancing act with end/health. 3acc/2end in total focus and probably a recharge next; Id like to keep the same recharge on TF and ET so I might slot that 3acc/1rch/2 dam or 1dam & 1 end. I really need to keep my end looking well since I have no power sink using /inv. I dont want to run out of end just as I reach fully fury too.
Slotting damage is great aslong as u can get away with it, its like a red inspiration; the damage itself doesnt scale like fury, the damage from a damage SO is a constant.
Mea Culpa about brawl and boxing : Brawl is 4.34 and Boxing is 4.42.
I have it slotted with 1 Acc, 2 EndReds and 1 Rchg tho, which makes it cost 2.51 end with a rchg of 1.81, pretty nifty as an auto attack, works really nice to build up that fury quickly when you're not facing lots of mobs and can't rely on aggro 
I read somewhere, and no i can't remember where, that in order for a brute to keep on an even keel with a scrapper damage wise requires a constant fury lvl of about 65%. I can't recall if thats with or without SO's, but i'd imagine it's with...as brutes do less damage than scrappers off the bat, but are able to outdamage them at full fury. This means slotting for damage is very important. I sympathise with the need to slot for recharge and end though. The point, i think...is that keeping fury at full by slotting recharge/end and slotting for damage are both important.
the nice thing about ss/elec is that you have an excellent end rec power so less end red needed and a nice acc buff so you need fewer acc SO's. I found on my em/ea brute although the ST damage was great, balancing end/recharge/damage/fury was a nightmare. Plus if your a teaming brute (so many just solo) its a whole different affair as keeping fury up in teams can be troublesome. Dominators for example (much as i love them - i have 2) can act as the anti-fury (tm) in teams. Brutes often complain they cant keep fury up with my plant/thorns as the AoE control is so effective. In those situations, having good base damage is vital.
I miss him in the weeping of the rain;
I want him at the shrinking of the tide;
The old snows melt from every mountain-side,
And last year's leaves are smoke in every lane;
But last year's bitter loving must remain
~Edna St. Vincent Millay
I'm fine with my base damage, and I'll have those end reds there till power sink, at which point I'll poke around.
agree about powersink, unless you wanna use it to sap in pvp or something. I actually slotting 2 rec 3 end mod and 1 end redux so i can get a better return from one mob at low end without the fear of detoggling...happens on rare occassions if i'm not watching carefully enough.
You actually only need the 2 recharge in Rage if your running lightning reflexes to make it perma, just like practiced brawler.
If need be you can squeeze an extra slot off by losing the third to-hit in rage, you really get a piddly return for the third...difference between 29% to 31% buff if memory serves.
I miss him in the weeping of the rain;
I want him at the shrinking of the tide;
The old snows melt from every mountain-side,
And last year's leaves are smoke in every lane;
But last year's bitter loving must remain
~Edna St. Vincent Millay