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It's possible that you were facing enemies that can reflect projectiles, for example chakrams, impale, rapid fire, ect.

Here's a few monsters that can do it:

http://diablo.wikia.com/wiki/Dune_Dervish

when they spin they can reflect physical projectiles back at team mates and kill them

http://diablo.wikia.com/wiki/Sand_Dweller

they have a sand shield attack that on hit can reflect projectiles back at you

UE is a bit trickier than usual because of the discipline damage. With that said, EW+SoJ is theoretically stronger, but it doesn't always work out in actuality and a lot depends on an individuals play style; whether they are playing in a group or solo, do you stutterstep a lot, and overall habits when an attack is launched right at you.

we'll assume we have 40% Fire from the bracers and ammy, 86 discipline as per usual, and 10% elite damage on the weapon, just to give FnR a hand for the comparison:
EW + SoJ:
EW is 100% more dmg, but we'll look at it for 0%, 25%, 50%, 75% and 100%
SoJ is giving us 20% more fire, 12 more discipline and 30% elite damage

= EW * Fire Damage * Elite Damage * (20 * Discipline)

@0% dmg:
= 1 * 1.6 * 1.4 * 20.6
= 46.144x more damage

@25% dmg:
= 1.25 * 1.6 * 1.4 * 20.6
= 57.68x more damage

@50% dmg:
= 1.50 * 1.6 * 1.4 * 20.6
= 69.216x more damage

@75% dmg:
= 1.75 * 1.6 * 1.4 * 20.6
= 80.752x more damage

@100% dmg:
= 2 * 1.6 * 1.4 * 20.6
= 92.288x more damage

IMO the extra primary on CP gets cancelled out by the lack of standard primaries on SoJ (can't get both CHC/CHD on SoJ), so I'll ignore that primary for now.
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FnR + Hellfire:
FnR is 125% more damage combined
the hellfire we'll say gives us ambush, so ~11.3% more dmg(with a 60% DML considered)

= FnR * Fire * Elite * Ambush * (20 * Discipline)
= 2.25 * 1.4 * 1.1 * 1.113 * 18.2
= 70.189119x more damage

but mind you this is active 100% of the time.
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conclusion:
50% of the time EW+SoJ is either more powerful by a fair bit, or quite a bit weaker. So I think use what ever suits your play style better.

http://us.battle.net/d3/en/forum/topic/18706676564#1

I made this a while ago when people didn't believe me about the CHC hard cap, it might have some useful info for you.