Your title suggests this is definitely a 100% fool proof way to master Bard! But now you reveal its just a theory you came up with which might not actually work in practice...
You could say it's a guide for bards that want to reach an extra mile... but not necessarily in the right direction! ;)
Anyway, one problem with this idea is that Empyreal Arrow's cooldown gets shorter the more Skill Speed you have. You could go for a 'no skillspeed' build, but then I think you'd struggle to get your opener out; its typically recommended that you have at least 700 to do this optimally. This brings your Emp Arrow cooldown to ~14 seconds, and it would no longer line up with your Iron Jaws usage as you suggest.
Also, its typically a DPS gain to refresh your dots early when you are popping cooldowns, and again just before they drop off; another reason you would struggle to keep EA and IJ usage in synch.
