Hi
First of all ty @nTx for this macro and allowing me to post this into your thread 
I have tinkered alot with nTx amazing macro to get both Fire Breath and Eternity Surge to shoot of auto and i think i have found a way.
I use this at 50 ms but it work at any ms. Fire Breath and Eternity Surge go off at 1 tick, but occasionaly 2 ticks but very rare.
Test and see if this works for you. Remember that this is for disabled and lazy ppl like me so top damage might be but might also not be 
I havent tested in dungeon due to my utterly crap 381 gear, PvP gear from AH
Best of luck.
ST
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