premonition works like old death except you dont have to target anyone. just wait for him to cast poly on you, which will most likely happen when their team is topped off, and press it. otherwise if they are low and or dying then they will prob cast poly on your teammates first, so just stick on pillar and spam dispel and on the 3rd poly he will most likely use it on you.
as for those talents, i dont think you really need them. you should only need up to relentless imo, healing archangel is really good, and what i use most games. it's better to keep your team topped / offensive then just have alittle more dmg imo. especially with spirit link, bubble , bop's etc
best thing to do as a disc team is to pull away if you guys are realy far behind. communicate your cd on fear and use it with intention. if you guys are a comp that's able to kill healers possibly, depending on healer, then while you gusy are training a healer or even a dps, let them know you have fear back up and you want to double fear dps (if you are unable to get to healer or you want to go him) and that they can stay offensive
on the other hand, if you guys fall behind, and you are unable to get fears and it seems pointless to be out on top of them, peel away and top everyone off, and when they push behind a pillar you can either cc them back there , double fear, root w/e and get good momentum rolling just from that. sometimes best thing to do is run away behind pillar and let them folow you then double fear and chase out against healer again