Question on Elder Charm of Good Fortune

Apparently I still quite confuse with Elder Charm of Good Fortune . 5 days ago , it was the 1st time I got the achievement Settle Down, Bro Settle Down Bro and I only got Cache of Sha-Touched Gold which contain 28g.

So last night after server up (after maintenance) about 3 hours before weekly raid reset ( oceanic realm / it was 1am my local time ), I went to another attempt at Sha of Anger again, but this time I use Elder Charm right after boss been defeated. I roll with it and got another Cache of Sha-Touched Gold for the 2nd time of this week. Sadly, I got another 28g. My other friends who join with me, they didn't use Elder charm and didn't got anything.

So here my question, if for example, you fail to get any good loot(only getting free gold) on your first attempt, you can try again for another attempt using Elder of Charm? Perhaps, do several kills/attempt till you win something nice. Is that possible or maybe I only will got gold from the boss if using Elder of Charm after the 1st attempt.

Thanks for your time and Im really sorry for my horrible English.

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