If it's only footstomp that's missing, you'll get better return from 2 Accuracies in it than 3 in Rage.
To be honest though, if you already have 3 Tohits in Rage you should be at about +31% Tohit, which combined with an Accuracy SO in each power will pretty much put you at the accuracy cap in PvE up to +4/5s.
What you might be seeing is the 5% of attacks that'll always miss no matter how much accuracy you have.
Firstly if you have Hasten, I would only put 2 recharges in Rage. If not put 3. Whilst you can stack Rage with 3 recharges and Hasten, I don't think the benefits of 20 seconds of double rage are worth the disadvantage of having a rage crash more often.
I think more than 1 ACC if you run perma rage is overkill and a waste of slots. Rage provides a to hit buff which is better against really hard to hit things ( high defence and high level ). Accuracy enhancements provide a accuracy bonus which helps most against things that are easier to hit. With 3 to hit buffs in Rage, a 1 ACC attack should have be at the 95% cap for anything with a base to hit of 40% or more. That's +5s or lower, or something with 35% defence. One or 2 to hit buffs will cap +4s if you slot 1 ACC in each attack.
On the other hand, I would always 6 slot any attack that I consider effective. Foot Stomp is worth 6 slotting, recharge is useful to get the downtime down.
@Unthing ... Mostly on Union.
I have not got rage yet as I was building for team/hi defence first. My next power will be rage.
I should be getting rage in about 2 to 3 lvls (40 or 41 I think), so is it worth using the slots somewhere else and wait for rage?
On my tank, I have Rage slotted 2 recharge and 2 to hit buff. I have my Foot Stomp slotted with 2 dam, 2 recharge and 2 end reds. I also run "perma" Hasten.
This caps me against +1s, but still gives me 76% to hit against +4s ( lowest level purple minions ) which I think is enough especially as it means Foot Stomp is up more. I'm an Ice tank so my taunt aura is auto hit.
My reasoning on only 2 damages is that I was doing badly for endurance and I figured perma-Rage with it's large damage buff means that recharge is probably more important than damage, especially for keeping aggro, but also for damage over time.
@Unthing ... Mostly on Union.
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I also run "perma" Hasten.
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Come again?
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
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I also run "perma" Hasten.
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Come again?
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3 slots. not actually perma so I put it in double quotes.
@Unthing ... Mostly on Union.
Oh no.. now im looking forward to rage and want it ASAP!!
What have you lot done to me! lol 
on Brimstone i slotted 1acc 2end 2recharge, with rage up the damage is nice enough without slotting imo whilest the endurance cost is a bit nasty ( endcost is 18 iirc )
@EU Brimmy - Union and Exalted servers
Ok.. just got foot stomp and loving it! (it only has 1 slot but still loving it!).
I am aiming for (as above) acc, dmg, dmg, dmg, endredux. With it slotted at the moment (just acc) it is missing some people. Does it have a max amount that it can hit or is it worth putting a 2nd acc in to increase the chances of it hitting everyone.
I am taking on a min of oranges up to purples at the moment (if that sways your opinion in any way).
The slot I would take it off is rage, I am aiming for 3 recharge and 3 tohit buffs on rage.. is this overkill? Would 1 tohit slot be better used in foot stomp to get a much better chance of it landing?